Abstract: This paper introduces the research and application of subdivision water injection technology at late high water cut stage in Daqing Oilfield. This paper systematically describes the "one small and one prevention(small intercalation, small stuck distance and prevention the interporosity flow when pressure measurement)" and hydraulic balllng subdivision water injection technologies in terms of string structure, downhole tools working principles, properties, parameters and the application of matching techniques. Field test proved that the technologies had increased the producing degree of recoverable reserves, and had resulted in great economic and social benefits.