Abstract: Ying 13-block is complicated fault-block reservoir with sharp heterogeneity in Dongxin oilfield.The block is broken and residual oil's distributed rule is complex.Based on analyzing the geological characters of reservoir such as structural feather,reserves distribution,oil physical proper- ty,and using the technology of numerical analogue,the au- thor has studied the residual oil distribution rule.The stud- ies show that distribution of residual oil lie in the undevel- oped block,block without drilling and high position at fault corner.It is proposed the present exploitive regulative draft and acquired an obvious potential exploitive result.