diff --git a/watcher/decision_engine/strategy/strategies/uniform_airflow.py b/watcher/decision_engine/strategy/strategies/uniform_airflow.py
index 0344f09b4..6f4d06565 100644
--- a/watcher/decision_engine/strategy/strategies/uniform_airflow.py
+++ b/watcher/decision_engine/strategy/strategies/uniform_airflow.py
@@ -140,7 +140,7 @@ class UniformAirflow(base.BaseStrategy):
         return used_res['vcpu'], used_res['memory'], used_res['disk']
 
     def choose_instance_to_migrate(self, hosts):
-        """Pick up an active instance instance to migrate from provided hosts
+        """Pick up an active instance to migrate from provided hosts
 
         :param hosts: the array of dict which contains node object
         """
diff --git a/watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py b/watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py
index 7ee541c59..b9a09e387 100644
--- a/watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py
+++ b/watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py
@@ -48,7 +48,7 @@ class VMWorkloadConsolidation(base.ServerConsolidationBaseStrategy):
     A capacity coefficients (cc) might be used to adjust optimization
     thresholds. Different resources may require different coefficient
     values as well as setting up different coefficient values in both
-    phases may lead to to more efficient consolidation in the end.
+    phases may lead to more efficient consolidation in the end.
     If the cc equals 1 the full resource capacity may be used, cc
     values lower than 1 will lead to resource under utilization and
     values higher than 1 will lead to resource overbooking.
diff --git a/watcher/decision_engine/strategy/strategies/workload_balance.py b/watcher/decision_engine/strategy/strategies/workload_balance.py
index ffd1565b0..076b5aad5 100644
--- a/watcher/decision_engine/strategy/strategies/workload_balance.py
+++ b/watcher/decision_engine/strategy/strategies/workload_balance.py
@@ -133,7 +133,7 @@ class WorkloadBalance(base.WorkloadStabilizationBaseStrategy):
                 cn.status in default_node_scope}
 
     def choose_instance_to_migrate(self, hosts, avg_workload, workload_cache):
-        """Pick up an active instance instance to migrate from provided hosts
+        """Pick up an active instance to migrate from provided hosts
 
         :param hosts: the array of dict which contains node object
         :param avg_workload: the average workload value of all nodes