diff --git a/src/layer/arm/convolution_arm.cpp b/src/layer/arm/convolution_arm.cpp
index 5491eabf4..2f7dea212 100644
--- a/src/layer/arm/convolution_arm.cpp
+++ b/src/layer/arm/convolution_arm.cpp
@@ -388,7 +388,7 @@ int Convolution_arm::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
         if (bottom_blob_bordered.empty())
             return -100;
 
@@ -403,7 +403,7 @@ int Convolution_arm::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -419,7 +419,7 @@ int Convolution_arm::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -521,7 +521,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
     }
     else if (pad_left == -233 && pad_right == -233 && pad_top == -233 && pad_bottom == -233)
     {
@@ -531,7 +531,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     else if (pad_left == -234 && pad_right == -234 && pad_top == -234 && pad_bottom == -234)
@@ -542,7 +542,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     if (bottom_blob_bordered.empty())
@@ -1027,7 +1027,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
     }
     else if (pad_left == -233 && pad_right == -233 && pad_top == -233 && pad_bottom == -233)
     {
@@ -1037,7 +1037,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     else if (pad_left == -234 && pad_right == -234 && pad_top == -234 && pad_bottom == -234)
@@ -1048,7 +1048,7 @@ int Convolution_arm::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     if (bottom_blob_bordered.empty())
diff --git a/src/layer/arm/convolutiondepthwise_arm.cpp b/src/layer/arm/convolutiondepthwise_arm.cpp
index 22b1b0d02..5b42018bb 100644
--- a/src/layer/arm/convolutiondepthwise_arm.cpp
+++ b/src/layer/arm/convolutiondepthwise_arm.cpp
@@ -439,7 +439,7 @@ int ConvolutionDepthWise_arm::forward(const Mat& bottom_blob, Mat& top_blob, con
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
     }
     else if (pad_left == -233 && pad_right == -233 && pad_top == -233 && pad_bottom == -233)
     {
@@ -449,7 +449,7 @@ int ConvolutionDepthWise_arm::forward(const Mat& bottom_blob, Mat& top_blob, con
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     else if (pad_left == -234 && pad_right == -234 && pad_top == -234 && pad_bottom == -234)
@@ -460,7 +460,7 @@ int ConvolutionDepthWise_arm::forward(const Mat& bottom_blob, Mat& top_blob, con
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     if (bottom_blob_bordered.empty())
diff --git a/src/layer/convolution.cpp b/src/layer/convolution.cpp
index e89ef48ff..16b4beb36 100644
--- a/src/layer/convolution.cpp
+++ b/src/layer/convolution.cpp
@@ -42,6 +42,7 @@ int Convolution::load_param(const ParamDict& pd)
     pad_right = pd.get(15, pad_left);
     pad_top = pd.get(14, pad_left);
     pad_bottom = pd.get(16, pad_top);
+    pad_value = pd.get(18, 0.f);
     bias_term = pd.get(5, 0);
     weight_data_size = pd.get(6, 0);
     int8_scale_term = pd.get(8, 0);
@@ -335,7 +336,7 @@ int Convolution::forward(const Mat& bottom_blob, Mat& top_blob, const Option& op
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
     }
     else if (pad_left == -233 && pad_right == -233 && pad_top == -233 && pad_bottom == -233)
     {
@@ -346,7 +347,7 @@ int Convolution::forward(const Mat& bottom_blob, Mat& top_blob, const Option& op
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     else if (pad_left == -234 && pad_right == -234 && pad_top == -234 && pad_bottom == -234)
@@ -358,7 +359,7 @@ int Convolution::forward(const Mat& bottom_blob, Mat& top_blob, const Option& op
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     if (bottom_blob_bordered.empty())
diff --git a/src/layer/convolution.h b/src/layer/convolution.h
index cbd00027b..0c55a4282 100644
--- a/src/layer/convolution.h
+++ b/src/layer/convolution.h
@@ -48,6 +48,7 @@ public:
     int pad_right;
     int pad_top;
     int pad_bottom;
+    float pad_value;
     int bias_term;
 
     int weight_data_size;
diff --git a/src/layer/convolutiondepthwise.cpp b/src/layer/convolutiondepthwise.cpp
index fd52059c5..d0f16c32b 100644
--- a/src/layer/convolutiondepthwise.cpp
+++ b/src/layer/convolutiondepthwise.cpp
@@ -41,6 +41,7 @@ int ConvolutionDepthWise::load_param(const ParamDict& pd)
     pad_right = pd.get(15, pad_left);
     pad_top = pd.get(14, pad_left);
     pad_bottom = pd.get(16, pad_top);
+    pad_value = pd.get(18, 0.f);
     bias_term = pd.get(5, 0);
     weight_data_size = pd.get(6, 0);
     group = pd.get(7, 1);
@@ -328,7 +329,7 @@ int ConvolutionDepthWise::forward(const Mat& bottom_blob, Mat& top_blob, const O
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
     }
     else if (pad_left == -233 && pad_right == -233 && pad_top == -233 && pad_bottom == -233)
     {
@@ -339,7 +340,7 @@ int ConvolutionDepthWise::forward(const Mat& bottom_blob, Mat& top_blob, const O
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     else if (pad_left == -234 && pad_right == -234 && pad_top == -234 && pad_bottom == -234)
@@ -351,7 +352,7 @@ int ConvolutionDepthWise::forward(const Mat& bottom_blob, Mat& top_blob, const O
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
         }
     }
     if (bottom_blob_bordered.empty())
diff --git a/src/layer/convolutiondepthwise.h b/src/layer/convolutiondepthwise.h
index 733953261..9705188e2 100644
--- a/src/layer/convolutiondepthwise.h
+++ b/src/layer/convolutiondepthwise.h
@@ -48,6 +48,7 @@ public:
     int pad_right;
     int pad_top;
     int pad_bottom;
+    float pad_value;
     int bias_term;
 
     int weight_data_size;
diff --git a/src/layer/vulkan/convolution_vulkan.cpp b/src/layer/vulkan/convolution_vulkan.cpp
index d6bd65c9a..e5c25eafc 100644
--- a/src/layer/vulkan/convolution_vulkan.cpp
+++ b/src/layer/vulkan/convolution_vulkan.cpp
@@ -57,7 +57,7 @@ int Convolution_vulkan::create_pipeline(const Option& opt)
         pd.set(2, pad_left);
         pd.set(3, pad_right);
         pd.set(4, 0);
-        pd.set(5, 0.f);
+        pd.set(5, pad_value);
 
         padding->load_param(pd);
 
diff --git a/src/layer/vulkan/convolutiondepthwise_vulkan.cpp b/src/layer/vulkan/convolutiondepthwise_vulkan.cpp
index baa93ca63..055e386eb 100644
--- a/src/layer/vulkan/convolutiondepthwise_vulkan.cpp
+++ b/src/layer/vulkan/convolutiondepthwise_vulkan.cpp
@@ -49,7 +49,7 @@ int ConvolutionDepthWise_vulkan::create_pipeline(const Option& opt)
         pd.set(2, pad_left);
         pd.set(3, pad_right);
         pd.set(4, 0);
-        pd.set(5, 0.f);
+        pd.set(5, pad_value);
 
         padding->load_param(pd);
 
diff --git a/src/layer/x86/convolution_x86.cpp b/src/layer/x86/convolution_x86.cpp
index 35dae1acd..726fed3f3 100644
--- a/src/layer/x86/convolution_x86.cpp
+++ b/src/layer/x86/convolution_x86.cpp
@@ -151,7 +151,7 @@ int Convolution_x86::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
         if (bottom_blob_bordered.empty())
             return -100;
 
@@ -166,7 +166,7 @@ int Convolution_x86::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -182,7 +182,7 @@ int Convolution_x86::forwardDilation(const Mat& bottom_blob, Mat& top_blob, conv
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -496,7 +496,7 @@ int Convolution_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
         if (bottom_blob_bordered.empty())
             return -100;
 
@@ -511,7 +511,7 @@ int Convolution_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -527,7 +527,7 @@ int Convolution_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
diff --git a/src/layer/x86/convolutiondepthwise_x86.cpp b/src/layer/x86/convolutiondepthwise_x86.cpp
index 139f008f2..85a74bb40 100644
--- a/src/layer/x86/convolutiondepthwise_x86.cpp
+++ b/src/layer/x86/convolutiondepthwise_x86.cpp
@@ -236,7 +236,7 @@ int ConvolutionDepthWise_x86::forward(const Mat& bottom_blob, Mat& top_blob, con
     {
         Option opt_b = opt;
         opt_b.blob_allocator = opt.workspace_allocator;
-        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, 0.f, opt_b);
+        copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, pad_top, pad_bottom, pad_left, pad_right, BORDER_CONSTANT, pad_value, opt_b);
         if (bottom_blob_bordered.empty())
             return -100;
 
@@ -251,7 +251,7 @@ int ConvolutionDepthWise_x86::forward(const Mat& bottom_blob, Mat& top_blob, con
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad / 2, hpad - hpad / 2, wpad / 2, wpad - wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }
@@ -267,7 +267,7 @@ int ConvolutionDepthWise_x86::forward(const Mat& bottom_blob, Mat& top_blob, con
         {
             Option opt_b = opt;
             opt_b.blob_allocator = opt.workspace_allocator;
-            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, 0.f, opt_b);
+            copy_make_border(bottom_blob_unbordered, bottom_blob_bordered, hpad - hpad / 2, hpad / 2, wpad - wpad / 2, wpad / 2, BORDER_CONSTANT, pad_value, opt_b);
             if (bottom_blob_bordered.empty())
                 return -100;
         }