diff --git a/nova/api/openstack/compute/contrib/quotas.py b/nova/api/openstack/compute/contrib/quotas.py
index bdf82ea86e13..728c3fad64da 100644
--- a/nova/api/openstack/compute/contrib/quotas.py
+++ b/nova/api/openstack/compute/contrib/quotas.py
@@ -23,10 +23,12 @@ from nova.api.openstack import xmlutil
 from nova import db
 from nova.db.sqlalchemy import api as sqlalchemy_api
 from nova import exception
+from nova.openstack.common import log as logging
 from nova import quota
 
 
 QUOTAS = quota.QUOTAS
+LOG = logging.getLogger(__name__)
 
 
 authorize_update = extensions.extension_authorizer('compute', 'quotas:update')
@@ -88,7 +90,14 @@ class QuotaSetsController(object):
         project_id = id
         for key in body['quota_set'].keys():
             if key in QUOTAS:
-                value = int(body['quota_set'][key])
+                try:
+                    value = int(body['quota_set'][key])
+                except (ValueError, TypeError):
+                    LOG.warn(_("Quota for %s should be integer.") % key)
+                    # NOTE(hzzhoushaoyu): Do not prevent valid value to be
+                    # updated. If raise BadRequest, some may be updated and
+                    # others may be not.
+                    continue
                 self._validate_quota_limit(value)
                 try:
                     db.quota_update(context, project_id, key, value)
diff --git a/nova/tests/api/openstack/compute/contrib/test_quotas.py b/nova/tests/api/openstack/compute/contrib/test_quotas.py
index 8d518b8159bc..6636824fd723 100644
--- a/nova/tests/api/openstack/compute/contrib/test_quotas.py
+++ b/nova/tests/api/openstack/compute/contrib/test_quotas.py
@@ -143,6 +143,45 @@ class QuotaSetsTest(test.TestCase):
         self.assertRaises(webob.exc.HTTPBadRequest, self.controller.update,
                           req, 'update_me', body)
 
+    def test_quotas_update_invalid_value(self):
+        expected_resp = {'quota_set': {
+                              'instances': 50, 'cores': 50,
+                              'ram': 51200, 'floating_ips': 10,
+                              'metadata_items': 128, 'injected_files': 5,
+                              'injected_file_content_bytes': 10240,
+                              'injected_file_path_bytes': 255,
+                              'security_groups': 10,
+                              'security_group_rules': 20,
+                              'key_pairs': 100}}
+
+        # when PUT JSON format with empty string for quota
+        body = {'quota_set': {'instances': 50, 'cores': 50,
+                              'ram': '', 'floating_ips': 10,
+                              'metadata_items': 128, 'injected_files': 5,
+                              'injected_file_content_bytes': 10240,
+                              'injected_file_path_bytes': 255,
+                              'security_groups': 10,
+                              'security_group_rules': 20,
+                              'key_pairs': 100}}
+        req = fakes.HTTPRequest.blank('/v2/fake4/os-quota-sets/update_me',
+                                      use_admin_context=True)
+        res_dict = self.controller.update(req, 'update_me', body)
+        self.assertEqual(res_dict, expected_resp)
+
+        # when PUT XML format with empty string for quota
+        body = {'quota_set': {'instances': 50, 'cores': 50,
+                              'ram': {}, 'floating_ips': 10,
+                              'metadata_items': 128, 'injected_files': 5,
+                              'injected_file_content_bytes': 10240,
+                              'injected_file_path_bytes': 255,
+                              'security_groups': 10,
+                              'security_group_rules': 20,
+                              'key_pairs': 100}}
+        req = fakes.HTTPRequest.blank('/v2/fake4/os-quota-sets/update_me',
+                                      use_admin_context=True)
+        res_dict = self.controller.update(req, 'update_me', body)
+        self.assertEqual(res_dict, expected_resp)
+
 
 class QuotaXMLSerializerTest(test.TestCase):
     def setUp(self):