Abstract: In view of the Daqing Xingnan oilfield the latter part of a block of high water cut wells,individual water injection zone lies some problems including the high well fluid,high water cut stage,the producing situation imbalanced,conventional waterflood difficult to further expand the swept volume and so on,the optimal well group implements the cyclic flooding.According to the cyclic flooding determined in the water injection mode,after implementation cyclic flooding,the production declined,water cut rise slowly,water injection improves.The result of numerical simulation indicates that it will raise the recovery ratio 0.68 percentage point.Which realized highly effective development of the high water cut late stage water injection.