Shortage of water resources becomes increasingly serious in Haihe Plain,so the top-ics concerning causes and mitigation countermeasures are urgent ly needed to be dealt with at present.Studies on the impact of flood control works on water resources of Haihe Plain are help-ful for resolving water resources shortage problem.Having analyzed the causes of drought and waterlogging and the system of flood control works in Haihe Plain,the paper points out that the flood control works have led to the reduction of the Plain's water resources and damaged its wa-ter resources reserves,and puts forward countermeasures aiming at mitigation of water resources shortage situation through restoring water resources reserves based on improvement of the flood control works.The new viewpoints that water resources reduction of the Haihe Plain resulting from flood control works and water resources increase by rehabilitating and reconstructing wet-lands such as lakes and marsh lands will give certain enlightenment to the overall reexamination of the flood control works,synthetic diagnosis of the causes of water resources shortage and rightly taking countermeasures of water resources shortage.