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diff --git a/docs/manage_role_by_ldap_group.md b/docs/manage_role_by_ldap_group.md
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@@ -0,0 +1,52 @@
+## Introduction
+
+This guide provides instructions to manage roles by LDAP/AD group. You can import an LDAP/AD group to Harbor and assign project roles to it. All LDAP/AD users in this LDAP/AD group have assigned roles.
+
+## Prerequisite
+
+1. Harbor's auth_mode is ldap_auth and **[basic LDAP configure paremters](https://github.com/vmware/harbor/blob/master/docs/installation_guide.md#optional-parameters)** are configured.
+1. Memberof overlay
+
+    This feature requires the LDAP/AD server enabled the feature **memberof overlay**. 
+    With this feature, the LDAP/AD user entity's attribute **memberof** is updated when the group entity's **member** attribute is updated. For example, adding or removing an LDAP/AD user from the LDAP/AD group.
+
+    * OpenLDAP -- Refer this **[guide](https://technicalnotes.wordpress.com/2014/04/19/openldap-setup-with-memberof-overlay/)** to enable and verify **memberof overlay**
+    * Active Directory -- this feature is enabled by default.
+
+## Configure LDAP group settings
+
+Besides **[basic LDAP configure paremters](https://github.com/vmware/harbor/blob/master/docs/installation_guide.md#optional-parameters)** , LDAP group related configure parameters should be configured, they can be configured before or after installation
+
+  1. Configure parameters in harbor.cfg before installation
+
+   * ldap_group_basedn -- The base DN from which to lookup a group in LDAP/AD, for example: ou=groups,dc=example,dc=com
+   * ldap_group_filter -- The filter to search LDAP/AD group, for example: objectclass=groupOfNames 
+   * ldap_group_gid    -- The attribute used to name an LDAP/AD group, for example: cn 
+   * ldap_group_scope  -- The scope to search for LDAP/AD groups. 0-LDAP_SCOPE_BASE, 1-LDAP_SCOPE_ONELEVEL, 2-LDAP_SCOPE_SUBTREE 
+
+  2. Or Change configure parameter in web console after installation. Go to "Administration" -> "Configuration" -> "Authentication" and change following settings.
+   - LDAP Group Base DN -- ldap_group_basedn in harbor.cfg
+   - LDAP Group Filter  -- ldap_group_filter in harbor.cfg
+   - LDAP Group GID     -- ldap_group_gid in harbor.cfg
+   - LDAP Group Scope   -- ldap_group_scope in harbor.cfg
+   - LDAP Groups With Admin Privilege -- Specify an LDAP/AD group DN, all LDAPA/AD users in this group have harbor admin privileges.
+
+![Screenshot of LDAP group config](img/group/ldap_group_config.png)
+
+## Assign project role to LDAP/AD group
+
+In "Project" -> "Members" -> "+ GROUP".
+
+![Screenshot of add group](img/group/ldap_group_addgroup.png)
+
+You can "Add an existing user group to project member" or "Add a group from LDAP to project member".
+
+![Screenshot of add group dialog](img/group/ldap_group_addgroup_dialog.png)
+
+Once an LDAP group is assigned a project role, log in with an LDAP/AD user in this group, the user should have the privilege of its group role.
+
+If a user is in the LDAP groups with admin privilege (ldap_group_admin_dn), the user should have the same privileges with Harbor admin.
+
+## User privileges and group privileges
+
+If a user has both user-level role and group-level role, only the user level role privileges will be considered.
diff --git a/docs/user_guide.md b/docs/user_guide.md
index fe3893357..48766b760 100644
--- a/docs/user_guide.md
+++ b/docs/user_guide.md
@@ -16,6 +16,7 @@ This guide walks you through the fundamentals of using Harbor. You'll learn how
   * [Manage self-registration.](#managing-self-registration)
   * [Manage email settings.](#managing-email-settings)
   * [Manage registry read only.](#managing-registry-read-only)
+  * [Manage role by LDAP group.](#managing-role-by-ldap-group)
 * [Pull and push images using Docker client.](#pulling-and-pushing-images-using-docker-client)
 * [Add description to repositories](#add-description-to-repositories)
 * [Delete repositories and images.](#deleting-repositories)
@@ -235,12 +236,16 @@ You can change Harbor's registry read only settings, read only mode will allow '
 If it set to true, deleting repository, tag and pushing image will be disabled. 
 ![browse project](img/read_only_enable.png)
 
+
 ```
 $ docker push 10.117.169.182/demo/ubuntu:14.04  
 The push refers to a repository [10.117.169.182/demo/ubuntu]
 0271b8eebde3: Preparing 
 denied: The system is in read only mode. Any modification is prohibited.  
 ``` 
+### Managing role by LDAP group
+
+If auth_mode is ldap_auth, you can manage project role by LDAP/AD group. please refer [manage role by ldap group guide](manage_role_by_ldap_group.md).
 
 ## Pulling and pushing images using Docker client