diff --git a/seahub/templates/pubuser.html b/seahub/templates/pubuser.html
index fd4e07eefc..305e33344c 100644
--- a/seahub/templates/pubuser.html
+++ b/seahub/templates/pubuser.html
@@ -13,7 +13,19 @@
 {% endblock %}
 
 {% block right_panel %}
-<h3 class="hd">{% trans "Members" %}</h3>
+{% if search %}
+<h3 class="hd">{% trans "Search Results" %}</h3>
+{% else %}
+<div class="tabnav ovhd">
+    <ul class="tabnav-tabs fleft">
+        <li class="tabnav-tab {% if not ldap %}tabnav-tab-cur{%endif%}"><a href="{% url 'pubuser' %}">{% trans "Database" %}</a></li>
+        {% if have_ldap_user %}
+        <li class="tabnav-tab {% if ldap %}tabnav-tab-cur{%endif%}"><a href="{% url 'pubuser' %}?ldap=1">{% trans "LDAP" %}</a></li>
+        {% endif %}
+    </ul>
+</div>
+{% endif %}
+
 {% if users %}
 <ul class="user-list">
     {% for u in users %}
@@ -34,17 +46,17 @@
 {% if show_paginator %}
 <div id="paginator">
     {% if has_prev %}
-    <a href="?page={{ current_page|add:"-1" }}">{% trans "Previous" %}</a>
+    <a href="?page={{ current_page|add:"-1" }}{% if ldap %}&ldap=1{%endif%}">{% trans "Previous" %}</a>
     {% endif %}
     {% for pr in page_range %}
       {% if pr == current_page %}
       <span class="cur">{{ pr }}</span>
       {% else %}
-      <a href="?page={{ pr }}" class="pg">{{ pr }}</a>
+      <a href="?page={{ pr }}{% if ldap %}&ldap=1{%endif%}" class="pg">{{ pr }}</a>
       {% endif %}
     {% endfor %}
     {% if has_next %}
-    <a href="?page={{ current_page|add:"1" }}">{% trans "Next" %}</a>
+    <a href="?page={{ current_page|add:"1" }}{% if ldap %}&ldap=1{%endif%}">{% trans "Next" %}</a>
     {% endif %}
 </div>
 {% endif %}
diff --git a/seahub/templates/sysadmin/user_search.html b/seahub/templates/sysadmin/user_search.html
index 42dddcdfb4..46e8d12582 100644
--- a/seahub/templates/sysadmin/user_search.html
+++ b/seahub/templates/sysadmin/user_search.html
@@ -7,7 +7,6 @@
 <h3>{% trans "Search User"%}</h3>
 
 <form id="search-user-form" method="get" action=".">
-  <p class="tip">{% trans "Tip: Use * to match any number of characters." %}</p>
   <label>{% trans "Email" %}</label><input type="text" name="email" class="input" value="{{email}}" /><br />
   <input type="submit" value="{% trans "Submit" %}" class="submit" />
 </form>
diff --git a/seahub/views/__init__.py b/seahub/views/__init__.py
index dacf366744..730253635c 100644
--- a/seahub/views/__init__.py
+++ b/seahub/views/__init__.py
@@ -1464,10 +1464,7 @@ def get_pub_users(request, start, limit):
         raise Http404           # no pubuser in cloud mode
 
     else:
-        # Get ldap users first, if no users found, use database.
-        users_plus_one = seaserv.get_emailusers('LDAP', start, limit)
-        if len(users_plus_one) == 0:
-            users_plus_one = seaserv.get_emailusers('DB', start, limit)
+        users_plus_one = seaserv.get_emailusers('DB', start, limit)
     return users_plus_one
 
 def count_pub_users(request):
@@ -1479,12 +1476,12 @@ def count_pub_users(request):
     elif request.cloud_mode:
         return 0
     else:
-        return seaserv.count_emailusers()
+        return seaserv.ccnet_threaded_rpc.count_emailusers('DB')
 
 @login_required
 def pubuser(request):
     """
-    Show public users.
+    Show public users in database or ldap depending on request arg ``ldap``.
     """
     if not request.user.permissions.can_view_org():
         raise Http404
@@ -1496,13 +1493,30 @@ def pubuser(request):
         current_page = 1
     per_page = 20           # show 20 users per-page
 
-    users_plus_one = get_pub_users(request, per_page * (current_page - 1),
-                                  per_page + 1)
+    # Show LDAP users or Database users.
+    have_ldap_user = True if len(seaserv.get_emailusers('LDAP', 0, 1)) > 0 else False
+
+    try:
+        ldap = True if int(request.GET.get('ldap', 0)) == 1 else False
+    except ValueError:
+        ldap = False
+
+    if ldap and have_ldap_user:
+        users_plus_one = seaserv.get_emailusers('LDAP',
+                                                per_page * (current_page - 1),
+                                                per_page + 1)
+    else:
+        users_plus_one = get_pub_users(request, per_page * (current_page - 1),
+                                       per_page + 1)
 
     has_prev = False if current_page == 1 else True
     has_next = True if len(users_plus_one) == per_page + 1 else False
 
-    emailusers_count = count_pub_users(request)
+    if ldap and have_ldap_user:
+        emailusers_count = seaserv.ccnet_threaded_rpc.count_emailusers('LDAP')
+    else:
+        emailusers_count = count_pub_users(request)
+
     num_pages = int(ceil(emailusers_count / float(per_page)))
     page_range = get_page_range(current_page, num_pages)
     show_paginator = True if len(page_range) > 1 else False
@@ -1526,6 +1540,8 @@ def pubuser(request):
                 'has_next': has_next,
                 'page_range': page_range,
                 'show_paginator': show_paginator,
+                'have_ldap_user': have_ldap_user,
+                'ldap': ldap,
                 }, context_instance=RequestContext(request))
 
 @login_required_ajax
diff --git a/seahub/views/sysadmin.py b/seahub/views/sysadmin.py
index 9b6370a14d..253ee2964b 100644
--- a/seahub/views/sysadmin.py
+++ b/seahub/views/sysadmin.py
@@ -318,7 +318,6 @@ def sys_user_admin_admins(request):
 @login_required
 @sys_staff_required
 def user_info(request, email):
-
     owned_repos = seafile_api.get_owned_repo_list(email)
 
     quota = seafile_api.get_user_quota(email)
@@ -795,16 +794,16 @@ def user_search(request):
     """Search a user.
     """
     email = request.GET.get('email', '')
-    email_patt = email.replace('*', '%')
-    
-    users  = ccnet_threaded_rpc.search_emailusers(email_patt, -1, -1)
+
+    users = ccnet_threaded_rpc.search_emailusers(email, -1, -1)
     last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
     for user in users:
         try:
             user.self_usage = seafile_api.get_user_self_usage(user.email)
             user.share_usage = seafile_api.get_user_share_usage(user.email)
             user.quota = seafile_api.get_user_quota(user.email)
-        except:
+        except SearpcError as e:
+            logger.error(e)
             user.self_usage = -1
             user.share_usage = -1
             user.quota = -1