diff --git a/docs/conf.py b/docs/conf.py
index 315394670a99a645f58aa0034f90924d74816c1a..e4e009f0d8d2edc5ae158b0ab5d680c9c45fcdc2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -40,6 +40,7 @@ copyright = '2019, nlp-ol@baidu.com'
 author = 'nlp-ol@baidu.com'
 
 # The full version, including alpha/beta/rc tags
+autodoc_mock_imports = ['paddle']
 
 # -- General configuration ---------------------------------------------------
 
@@ -95,22 +96,8 @@ def skip(app, what, name, obj, would_skip, options):
     return would_skip
 
 
-aliases = dict()
-aliases['parl.core.fluid.agent.Agent'] = ['parl.agent']
-
-
-def parl_class_docstring(app, what, name, obj, options, lines):
-    if what != 'class':
-        return
-    obj = parl.Agent
-    name = parl.Agent
-
-    #lines[0] = ['wohenhao']
-
-
 def setup(app):
     app.connect("autodoc-skip-member", skip)
-    app.connect("autodoc-process-docstring", parl_class_docstring)
 
 
 add_module_names = False
diff --git a/docs/installation.rst b/docs/installation.rst
index 8cad985923ee617ce12125df729533f794abfc78..9685bb26a602e1d8bc356d5142eef099ef703433 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -3,7 +3,7 @@ Installation
 Dependencies
 -------------------
 - Python 2.7 or 3.5+.
-- PaddlePaddle >=1.2.1 (**Optional**, if you only want to use APIs related to parallelization alone)
+- PaddlePaddle >=1.5.1 (**Optional**, if you only want to use APIs related to parallelization alone)
 
 Install
 -------------