diff --git a/venus/task/adapter.py b/venus/task/adapter.py
index aa56ae7..646e0c2 100644
--- a/venus/task/adapter.py
+++ b/venus/task/adapter.py
@@ -13,11 +13,10 @@
 # under the License.
 
 """A Timer Task With APScheduler."""
-from oslo_config import cfg
+
 from oslo_log import log as logging
 from venus.task.core import delete_es_index_task
 
-CONF = cfg.CONF
 LOG = logging.getLogger(__name__)
 
 
diff --git a/venus/task/backends/models.py b/venus/task/backends/models.py
index 135b7d3..d2886b8 100644
--- a/venus/task/backends/models.py
+++ b/venus/task/backends/models.py
@@ -16,13 +16,12 @@
 SQLAlchemy models for venus data.
 """
 
-from oslo_config import cfg
 from oslo_db.sqlalchemy import models
 from oslo_utils import timeutils
 from sqlalchemy import Column
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import DateTime, String
-CONF = cfg.CONF
+from venus.conf import CONF
 BASE = declarative_base()
 
 
diff --git a/venus/task/backends/sql.py b/venus/task/backends/sql.py
index 553d195..ff5bc6c 100644
--- a/venus/task/backends/sql.py
+++ b/venus/task/backends/sql.py
@@ -16,16 +16,15 @@
 import socket
 import time
 
-from oslo_config import cfg
 from oslo_db import options
 from oslo_log import log as logging
 
+from venus.conf import CONF
 from venus.db.common import _create_facade_lazily
 from venus.i18n import _LE
 from venus.task.backends import models
 
 # abc
-CONF = cfg.CONF
 CONF.import_group("profiler", "venus.service")
 log = logging.getLogger(__name__)
 options.set_defaults(CONF, connection='sqlite:///$state_path/venus.sqlite')
diff --git a/venus/task/core/delete_es_index_task.py b/venus/task/core/delete_es_index_task.py
index 3513663..de4325b 100644
--- a/venus/task/core/delete_es_index_task.py
+++ b/venus/task/core/delete_es_index_task.py
@@ -16,17 +16,18 @@ import datetime
 import six
 import time
 
-from oslo_config import cfg
+
 from oslo_log import log as logging
 
 
 from venus.common import utils
+from venus.conf import CONF
 from venus.modules.custom_config.backends.sql import CustomConfigSql
 from venus.modules.search.search_lib import ESSearchObj
 from venus.i18n import _LE, _LI
 from venus.task.backends.sql import TaskSql
 
-CONF = cfg.CONF
+
 LOG = logging.getLogger(__name__)
 
 TASK_NAME = "delete_es_index"
diff --git a/venus/task/timer.py b/venus/task/timer.py
index ac2b4d5..a272810 100644
--- a/venus/task/timer.py
+++ b/venus/task/timer.py
@@ -14,12 +14,10 @@
 
 """A Timer Task With APScheduler."""
 from apscheduler.schedulers.blocking import BlockingScheduler
-from oslo_config import cfg
 from oslo_log import log as logging
 from venus.task import adapter
 
 LOG = logging.getLogger(__name__)
-CONF = cfg.CONF
 
 sched = BlockingScheduler()