Abstract: Since the development of Shuanghe oilfield,different development manners have been adopted to enhance oil recovery, from water flooding to primary and secondary well pattern thickening.However,when the oilfield enters into later stage with high water cut,the stable production will become the primary task of development and then the drilling of new wells will be the key to realize it.Therefore,the number of new wells and rationality of well spacing density will be of great importance.By means of Karasseff formula, the relation model between well spacing density and oil recovery, and economic and technical limit of rational well spacing density have been established in Shuanghe oilfield, which will provide a solid theory foundation for stable production of oilfield.