diff --git a/releasenotes/notes/add-show-volume-summary-api-to-v3-volumes-client-96e7b01abdb5c9c3.yaml b/releasenotes/notes/add-show-volume-summary-api-to-v3-volumes-client-96e7b01abdb5c9c3.yaml
new file mode 100644
index 0000000..361e387
--- /dev/null
+++ b/releasenotes/notes/add-show-volume-summary-api-to-v3-volumes-client-96e7b01abdb5c9c3.yaml
@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Define v3 volumes_client for the volume service as a library interface,
+    allowing other projects to use this module as a stable library without
+    maintenance changes.
+    Add show volume summary API to v3 volumes_client library, min_microversion
+    of this API is 3.12.
+
+    * volumes_client(v3)
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index cc1e087..3f33c7b 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -80,6 +80,9 @@
         cls.messages_client = cls.os_primary.volume_v3_messages_client
         cls.versions_client = cls.os_primary.volume_v3_versions_client
 
+        if cls._api_version == 3:
+            cls.volumes_client = cls.os_primary.volumes_v3_client
+
     def setUp(self):
         super(BaseVolumeTest, self).setUp()
         self.useFixture(api_microversion_fixture.APIMicroversionFixture(
@@ -266,6 +269,9 @@
             cls.os_admin.volume_scheduler_stats_v2_client
         cls.admin_messages_client = cls.os_admin.volume_v3_messages_client
 
+        if cls._api_version == 3:
+            cls.admin_volume_client = cls.os_admin.volumes_v3_client
+
     @classmethod
     def resource_setup(cls):
         super(BaseVolumeAdminTest, cls).resource_setup()
diff --git a/tempest/api/volume/test_volumes_get.py b/tempest/api/volume/test_volumes_get.py
index 712254e..ec9a0dd 100644
--- a/tempest/api/volume/test_volumes_get.py
+++ b/tempest/api/volume/test_volumes_get.py
@@ -137,3 +137,17 @@
         origin = self.create_volume()
         self._volume_create_get_update_delete(source_volid=origin['id'],
                                               size=CONF.volume.volume_size)
+
+
+class VolumesSummaryTest(base.BaseVolumeTest):
+
+    _api_version = 3
+    min_microversion = '3.12'
+    max_microversion = 'latest'
+
+    @decorators.idempotent_id('c4f2431e-4920-4736-9e00-4040386b6feb')
+    def test_show_volume_summary(self):
+        volume_summary = \
+            self.volumes_client.show_volume_summary()['volume-summary']
+        for key in ['total_size', 'total_count']:
+            self.assertIn(key, volume_summary)
diff --git a/tempest/clients.py b/tempest/clients.py
index 73a4b20..4baa31d 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -269,6 +269,7 @@
         self.volume_manage_v2_client = self.volume_v2.VolumeManageClient()
         self.volumes_client = self.volume_v1.VolumesClient()
         self.volumes_v2_client = self.volume_v2.VolumesClient()
+        self.volumes_v3_client = self.volume_v3.VolumesClient()
         self.volume_v3_messages_client = self.volume_v3.MessagesClient()
         self.volume_v3_versions_client = self.volume_v3.VersionsClient()
         self.volume_types_client = self.volume_v1.TypesClient()
diff --git a/tempest/lib/services/volume/v3/__init__.py b/tempest/lib/services/volume/v3/__init__.py
index 72ab785..07ae917 100644
--- a/tempest/lib/services/volume/v3/__init__.py
+++ b/tempest/lib/services/volume/v3/__init__.py
@@ -15,5 +15,6 @@
 from tempest.lib.services.volume.v3.base_client import BaseClient
 from tempest.lib.services.volume.v3.messages_client import MessagesClient
 from tempest.lib.services.volume.v3.versions_client import VersionsClient
+from tempest.lib.services.volume.v3.volumes_client import VolumesClient
 
-__all__ = ['MessagesClient', 'BaseClient', 'VersionsClient']
+__all__ = ['MessagesClient', 'BaseClient', 'VersionsClient', 'VolumesClient']
diff --git a/tempest/lib/services/volume/v3/volumes_client.py b/tempest/lib/services/volume/v3/volumes_client.py
new file mode 100644
index 0000000..aec0205
--- /dev/null
+++ b/tempest/lib/services/volume/v3/volumes_client.py
@@ -0,0 +1,42 @@
+# Copyright 2017 FiberHome Telecommunication Technologies CO.,LTD
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
+from tempest.lib.services.volume.v2 import volumes_client
+from tempest.lib.services.volume.v3 import base_client
+
+
+class VolumesClient(base_client.BaseClient,
+                    volumes_client.VolumesClient):
+    """Client class to send CRUD Volume V3 API requests"""
+    api_version = "v3"
+
+    def show_volume_summary(self, **params):
+        """Get volumes summary.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        https://developer.openstack.org/api-ref/block-storage/v3/#get-volumes-summary
+        """
+        url = 'volumes/summary'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/tests/lib/services/volume/v3/test_volumes_client.py b/tempest/tests/lib/services/volume/v3/test_volumes_client.py
new file mode 100644
index 0000000..a515fd3
--- /dev/null
+++ b/tempest/tests/lib/services/volume/v3/test_volumes_client.py
@@ -0,0 +1,48 @@
+# Copyright 2017 FiberHome Telecommunication Technologies CO.,LTD
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.lib.services.volume.v3 import volumes_client
+from tempest.tests.lib import fake_auth_provider
+from tempest.tests.lib.services import base
+
+
+class TestVolumesClient(base.BaseServiceTest):
+
+    FAKE_VOLUME_SUMMARY = {
+        "volume-summary": {
+            "total_size": 20,
+            "total_count": 5
+        }
+    }
+
+    def setUp(self):
+        super(TestVolumesClient, self).setUp()
+        fake_auth = fake_auth_provider.FakeAuthProvider()
+        self.client = volumes_client.VolumesClient(fake_auth,
+                                                   'volume',
+                                                   'regionOne')
+
+    def _test_show_volume_summary(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.show_volume_summary,
+            'tempest.lib.common.rest_client.RestClient.get',
+            self.FAKE_VOLUME_SUMMARY,
+            bytes_body)
+
+    def test_show_volume_summary_with_str_body(self):
+        self._test_show_volume_summary()
+
+    def test_show_volume_summary_with_bytes_body(self):
+        self._test_show_volume_summary(bytes_body=True)