Abstract: The long time of exploitation of water injection in Daqing oilfield is now in the high water cut stage, the oil water distribution in the reservoir becomes more and more complex, and its motion law is more and more difficult to predict. The reservoir dynamic analysis and numerical simulation method to study the remaining oil, to maximize the use of existing test and production data, study the high water cut period within the reservoir remaining oil distribution, realize the rule of oil-water movement and accurate pre measured remaining oil distribution characteristics. The results show that there are 5 kinds of distribution types of remaining oil in the study area: 1)The remaining oil of good sand edge scattered; 2)The main good sand sand edge continuous distribution difference of regional distribution difference of reservoir sand body in;3)The difference in sand layer due to the shielding layer form a contiguous distribution of remaining oil;4)The difference of sand sand alone due to imperfect injection production of remaining oil distribution in the contiguous;5)The difference of reservoir sand body alone too imperfect injection production formation of scattered remaining oil. The remaining oil from the vertical upward research area is the following 5 types of distribution:1)Remaining oil in the low permeability layer of the section;2)Remaining oil in the low permeability layer of the high permeability layer in the section;3)Remaining oil in thick layer sand body;4)Sand pinch out area of the remaining oil in the section;5)The remaining oil sand perforation is not perfect.