diff --git a/modelscope/metainfo.py b/modelscope/metainfo.py
index a3b0bd67..da0cb0e8 100644
--- a/modelscope/metainfo.py
+++ b/modelscope/metainfo.py
@@ -70,7 +70,7 @@ class Pipelines(object):
         For pipeline which suuport only one model, we should use ${Model}-${Task} as its name.
     """
     # vision tasks
-    image_matting = 'unet-image-matting'
+    portrait_matting = 'unet-image-matting'
     image_denoise = 'nafnet-image-denoise'
     person_image_cartoon = 'unet-person-image-cartoon'
     ocr_detection = 'resnet18-ocr-detection'
diff --git a/modelscope/outputs.py b/modelscope/outputs.py
index 932d8abf..55f47ba3 100644
--- a/modelscope/outputs.py
+++ b/modelscope/outputs.py
@@ -127,7 +127,6 @@ TASK_OUTPUTS = {
     # {
     #   "output_img": np.array with shape(h, w, 4)
     # }
-    Tasks.image_matting: [OutputKeys.OUTPUT_IMG],
     Tasks.portrait_matting: [OutputKeys.OUTPUT_IMG],
 
     # image editing task result for a single image
diff --git a/modelscope/pipelines/builder.py b/modelscope/pipelines/builder.py
index 7c0a408f..21bdd36c 100644
--- a/modelscope/pipelines/builder.py
+++ b/modelscope/pipelines/builder.py
@@ -33,8 +33,8 @@ DEFAULT_MODEL_FOR_PIPELINE = {
     (Pipelines.sentiment_classification,
      'damo/nlp_structbert_sentiment-classification_chinese-base'
      ),  # TODO: revise back after passing the pr
-    Tasks.image_matting: (Pipelines.image_matting,
-                          'damo/cv_unet_image-matting'),
+    Tasks.portrait_matting: (Pipelines.portrait_matting,
+                             'damo/cv_unet_image-matting'),
     Tasks.human_detection: (Pipelines.human_detection,
                             'damo/cv_resnet18_human-detection'),
     Tasks.image_object_detection: (Pipelines.object_detection,
diff --git a/modelscope/pipelines/cv/image_matting_pipeline.py b/modelscope/pipelines/cv/image_matting_pipeline.py
index 2f9d39c3..5991a6a9 100644
--- a/modelscope/pipelines/cv/image_matting_pipeline.py
+++ b/modelscope/pipelines/cv/image_matting_pipeline.py
@@ -17,8 +17,6 @@ logger = get_logger()
 
 @PIPELINES.register_module(
     Tasks.portrait_matting, module_name=Pipelines.image_matting)
-@PIPELINES.register_module(
-    Tasks.image_matting, module_name=Pipelines.image_matting)
 class ImageMattingPipeline(Pipeline):
 
     def __init__(self, model: str, **kwargs):
diff --git a/modelscope/utils/constant.py b/modelscope/utils/constant.py
index d0941903..f11546b1 100644
--- a/modelscope/utils/constant.py
+++ b/modelscope/utils/constant.py
@@ -31,7 +31,6 @@ class CVTasks(object):
     image_object_detection = 'image-object-detection'
 
     image_segmentation = 'image-segmentation'
-    image_matting = 'image-matting'
     portrait_matting = 'portrait-matting'
 
     # image editing