diff --git a/manila_tempest_tests/tests/api/admin/test_replication.py b/manila_tempest_tests/tests/api/admin/test_replication.py
index b5b340c..853471c 100644
--- a/manila_tempest_tests/tests/api/admin/test_replication.py
+++ b/manila_tempest_tests/tests/api/admin/test_replication.py
@@ -83,6 +83,7 @@
         return [replica['id'] for replica in replica_list
                 if replica['replica_state'] == r_state]
 
+    @decorators.unstable_test(bug='1631314')
     @decorators.idempotent_id('0213cdfd-6a0f-4f24-a154-69796888a64a')
     @tc.attr(base.TAG_POSITIVE, base.TAG_BACKEND)
     @ddt.data(
@@ -211,6 +212,7 @@
             self.admin_client, replica['id'], constants.STATUS_ERROR,
             resource_name='share_replica', status_attr='replica_state')
 
+    @decorators.unstable_test(bug='1631314')
     @decorators.idempotent_id('2969565a-85e8-4c61-9dfb-cc7f7ca9f6dd')
     @tc.attr(base.TAG_POSITIVE, base.TAG_BACKEND)
     @ddt.data(
diff --git a/manila_tempest_tests/tests/api/test_replication_negative.py b/manila_tempest_tests/tests/api/test_replication_negative.py
index 90c52c7..e7d0e7d 100644
--- a/manila_tempest_tests/tests/api/test_replication_negative.py
+++ b/manila_tempest_tests/tests/api/test_replication_negative.py
@@ -137,6 +137,7 @@
                           self.shares_v2_client.delete_share,
                           self.share1["id"])
 
+    @decorators.unstable_test(bug='1631314')
     @decorators.idempotent_id('b9c2e57b-f1ae-475c-9d0b-df75dbe93b61')
     @tc.attr(base.TAG_NEGATIVE, base.TAG_API_WITH_BACKEND)
     def test_promote_out_of_sync_share_replica(self):
diff --git a/releasenotes/notes/bug-1631314-1509db08c75ff645.yaml b/releasenotes/notes/bug-1631314-1509db08c75ff645.yaml
new file mode 100644
index 0000000..601ff57
--- /dev/null
+++ b/releasenotes/notes/bug-1631314-1509db08c75ff645.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    `Bug #1631314 <https://bugs.launchpad.net/manila/+bug/1631314>`_:
+    Fixed an issue on unstable replication tests.