Abstract: With the methods of fine reservoir numerical simulation and sealed coring, the residual oil distribution of IV5-11 layer series of Shuanghe oilfield has been deeply studied. By using of typical models, layer series subdivision and technology limit research on well pattern adjustment have been carried out. On the basis of that, the subdivision and reconstruction of IV5-11 layer series has been conducted, obviously improving the sweep efficiency horizontally and vertically, and providing suitable well pattern conditions for making the combination flooding system into full play.