diff --git a/apps/dpm/models.py b/apps/dpm/models.py
index b46d193e..fd4dfe10 100644
--- a/apps/dpm/models.py
+++ b/apps/dpm/models.py
@@ -78,8 +78,9 @@ class CheckWork(CommonAModel):
     description = models.TextField('工作描述', null=True, blank=True)
     type = models.PositiveSmallIntegerField('任务类型', default=10, choices=CW_TYPE)
     category = models.ForeignKey('system.dictionary', on_delete=models.CASCADE, verbose_name='工作分类', null=True, blank=True)
+    usable = models.BooleanField('是否可用', default=True)
     time_start = models.DateTimeField('开启时间')
-    time_end = models.DateTimeField('关闭时间')
+    time_end = models.DateTimeField('关闭时间', null=True, blank=True)
     user_duty = models.ForeignKey('system.user', verbose_name='指派人', on_delete=models.SET_NULL, null=True, blank=True)
     riskpoint = models.ForeignKey(RiskPoint, verbose_name='关联风险点', related_name='cwork_riskpoint', on_delete=models.SET_NULL, null=True, blank=True)
     note = models.TextField('检查备注', null=True, blank=True)