diff --git a/ge/graph/build/graph_builder.cc b/ge/graph/build/graph_builder.cc
index d3e11969..d8219c29 100644
--- a/ge/graph/build/graph_builder.cc
+++ b/ge/graph/build/graph_builder.cc
@@ -269,24 +269,7 @@ Status GraphBuilder::BuildForKnownShapeGraph(ComputeGraphPtr &comp_graph, std::v
   return SUCCESS;
 }
 
-Status GraphBuilder::BuildForUnknownShapeGraph(ComputeGraphPtr &comp_graph, GeModelPtr &ge_model_ptr,
-                                               uint64_t session_id) {
-  ModelPtr model_ptr = MakeShared<ge::Model>();
-  if (model_ptr == nullptr) {
-    return MEMALLOC_FAILED;
-  }
-
-  Graph2SubGraphInfoList subgraph_map;
-  ge::ModelBuilder builder(session_id, comp_graph, subgraph_map, stream_max_parallel_num_, hcom_parallel_, build_mode_);
-  GE_CHK_STATUS_RET(builder.PreBuildModel(), "Failed to pre build model.");
-
-  GELOGI("Begin to build unknown shape graph[%s].", comp_graph->GetName().c_str());
-  GE_TIMESTAMP_START(CalcOpParam);
-  GE_CHK_STATUS_RET(CalcOpParam(comp_graph), "Graph[%s] builder CalcOpParam() return fail.",
-                    comp_graph->GetName().c_str());
-  GE_TIMESTAMP_END(CalcOpParam, "GraphBuilder::CalcOpParam");
-  GE_DUMP(comp_graph, "AfterCalcOpParam");
-
+Status GraphBuilder::SetConstantInputOffset(ComputeGraphPtr &comp_graph) {
   for (auto &node : comp_graph->GetDirectNode()) {
     GE_CHECK_NOTNULL(node);
     auto op_desc = node->GetOpDesc();
@@ -320,6 +303,7 @@ Status GraphBuilder::BuildForUnknownShapeGraph(ComputeGraphPtr &comp_graph, GeMo
       GE_CHECK_NOTNULL(weight);
       int64_t input_offset = 0;
       (void) TensorUtils::GetDataOffset(weight->MutableTensorDesc(), input_offset);
+      // valid_input_index must smaller than num_inputs
       input_offsets[valid_input_index] = input_offset;
       GELOGD("[%s] input[%u] is const, offset = %ld", node->GetName().c_str(), valid_input_index, input_offset);
     }
@@ -328,6 +312,27 @@ Status GraphBuilder::BuildForUnknownShapeGraph(ComputeGraphPtr &comp_graph, GeMo
     std::vector<int64_t> output_offsets(op_desc->GetOutputsSize(), 0);
     op_desc->SetOutputOffset(output_offsets);
   }
+}
+
+Status GraphBuilder::BuildForUnknownShapeGraph(ComputeGraphPtr &comp_graph, GeModelPtr &ge_model_ptr,
+                                               uint64_t session_id) {
+  ModelPtr model_ptr = MakeShared<ge::Model>();
+  if (model_ptr == nullptr) {
+    return MEMALLOC_FAILED;
+  }
+
+  Graph2SubGraphInfoList subgraph_map;
+  ge::ModelBuilder builder(session_id, comp_graph, subgraph_map, stream_max_parallel_num_, hcom_parallel_, build_mode_);
+  GE_CHK_STATUS_RET(builder.PreBuildModel(), "Failed to pre build model.");
+
+  GELOGI("Begin to build unknown shape graph[%s].", comp_graph->GetName().c_str());
+  GE_TIMESTAMP_START(CalcOpParam);
+  GE_CHK_STATUS_RET(CalcOpParam(comp_graph), "Graph[%s] builder CalcOpParam() return fail.",
+                    comp_graph->GetName().c_str());
+  GE_TIMESTAMP_END(CalcOpParam, "GraphBuilder::CalcOpParam");
+  GE_DUMP(comp_graph, "AfterCalcOpParam");
+
+  GE_CHK_STATUS_RET(SetConstantInputOffset(comp_graph), "Failed to set constant input offset.");
   GE_CHK_STATUS_RET(builder.MergeWeights(), "Failed to merge weights.");
 
   GE_TIMESTAMP_START(BuildModelForGetDynShapeTask);
diff --git a/ge/graph/build/graph_builder.h b/ge/graph/build/graph_builder.h
index 329f3ebc..b828a80d 100644
--- a/ge/graph/build/graph_builder.h
+++ b/ge/graph/build/graph_builder.h
@@ -67,6 +67,7 @@ class GraphBuilder {
                                  GeModelPtr &ge_model_ptr, uint64_t session_id = INVALID_SESSION_ID);
   Status BuildForUnknownShapeGraph(ComputeGraphPtr &comp_graph, GeModelPtr &ge_model_ptr,
                                    uint64_t session_id = INVALID_SESSION_ID);
+  Status SetConstantInputOffset(ComputeGraphPtr &comp_graph);
   Status AddOutputMemTypeForNode(const NodePtr &node);
   Status BuildForHostCpuGraph(ComputeGraphPtr &comp_graph, GeModelPtr &ge_model_ptr,
                               uint64_t session_id = INVALID_SESSION_ID);