diff --git a/docs/index.rst b/docs/index.rst
index bd2c750..6549762 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -31,6 +31,7 @@ Content
    misc
    network
    path
+   platform
    request
    set
    string
diff --git a/docs/platform.rst b/docs/platform.rst
new file mode 100644
index 0000000..f87fb8a
--- /dev/null
+++ b/docs/platform.rst
@@ -0,0 +1,51 @@
+Platform
+--------
+
+.. py:data:: pydu.platform.WINDOWS
+
+    Judge whether current platform is WINDOWS or not.
+
+
+.. py:data:: pydu.platform.LINUX
+
+    Judge whether current platform is LINUX or not.
+
+
+.. py:data:: pydu.platform.POSIX
+
+    Judge whether current platform is POSIX or not.
+
+
+.. py:data:: pydu.platform.DARWIN
+
+    Judge whether current platform is DARWIN or not.
+
+
+.. py:data:: pydu.platform.SUNOS
+
+    Judge whether current platform is SUNOS or not.
+
+
+.. py:data:: pydu.platform.SMARTOS
+
+    Judge whether current platform is SMARTOS or not.
+
+
+.. py:data:: pydu.platform.FREEBSD
+
+    Judge whether current platform is FREEBSD or not.
+
+
+.. py:data:: pydu.platform.NETBSD
+
+    Judge whether current platform is NETBSD or not.
+
+
+.. py:data:: pydu.platform.OPENBSD
+
+    Judge whether current platform is OPENBSD or not.
+
+
+.. py:data:: pydu.platform.AIX
+
+    Judge whether current platform is AIX or not.