diff --git a/docs/conf.py b/docs/conf.py
index d5d58276..a25b8cf4 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -51,7 +51,7 @@ extensions = [
     'sphinx_copybutton',
 ]
 
-autodoc_mock_imports = ['mmcv._ext']
+autodoc_mock_imports = ['mmcv._ext', 'matplotlib']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
diff --git a/docs_zh-CN/conf.py b/docs_zh-CN/conf.py
index f5df9a1a..14b4217f 100644
--- a/docs_zh-CN/conf.py
+++ b/docs_zh-CN/conf.py
@@ -51,7 +51,7 @@ extensions = [
     'sphinx_copybutton',
 ]
 
-autodoc_mock_imports = ['mmcv._ext']
+autodoc_mock_imports = ['mmcv._ext', 'matplotlib']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']