diff --git a/doc/fluid/api/gen_index.py b/doc/fluid/api/gen_index.py
index 4189918e875f0594f411e1d4e83ac366dbfa9d0f..51aa256fe06bb3ef3c3e81bfca2453190af180d4 100644
--- a/doc/fluid/api/gen_index.py
+++ b/doc/fluid/api/gen_index.py
@@ -10,7 +10,7 @@ API Reference
 =============
 
 ..  toctree::
-
+    :maxdepth: 1
 
 ''')
     file_object.write('    ../api_guides/index_en.rst'+'\n')
diff --git a/doc/fluid/api/index_en.rst b/doc/fluid/api/index_en.rst
index d49136c06b736fd309102864b769506f35a601ab..b66676b23a37f77c0d0798279e977641680c15c4 100644
--- a/doc/fluid/api/index_en.rst
+++ b/doc/fluid/api/index_en.rst
@@ -3,7 +3,7 @@ API Reference
 =============
 
 ..  toctree::
-
+    :maxdepth: 1
 
     ../api_guides/index_en.rst
     fluid.rst
diff --git a/doc/fluid/api_cn/gen_index.py b/doc/fluid/api_cn/gen_index.py
index 9e77c1d1958676a01f7662d495fb6e28542a64b8..860866b025b19261812707d8c9db10f7ebc4a8b7 100644
--- a/doc/fluid/api_cn/gen_index.py
+++ b/doc/fluid/api_cn/gen_index.py
@@ -10,7 +10,7 @@ API Reference
 =============
 
 ..  toctree::
-
+    :maxdepth: 1
 
 ''')
     file_object.write('    ../api_guides/index.rst'+'\n')
diff --git a/doc/fluid/api_cn/index_cn.rst b/doc/fluid/api_cn/index_cn.rst
index 2b0266f6eeaa5b6a56f4ba27570e74117184063c..5686f640f8faa04ad5496f65c785a311ddb06a90 100644
--- a/doc/fluid/api_cn/index_cn.rst
+++ b/doc/fluid/api_cn/index_cn.rst
@@ -3,7 +3,7 @@ API
 =====
 
 ..  toctree::
-
+    :maxdepth: 1
 
     ../api_guides/index.rst
     fluid_cn.rst