Abstract: Most blocks of Bohai Oilfield belong to layered sandstone reservoirs. After years of development, the interference of each layer in the large sand control section is serious which is unable to meet the needs of oilfield fine development. In order to realize the fine water injection/production allocation operation in the annulus of screen pipe and casing in the large sand control section of Bohai Oilfield, ACP material is selected to inject into the annulus of screen sleeve for sealing, and the fine water injection/production allocation string in the corresponding layer is put into the screen pipe for operation. Through the comparison of the performance of different subdivision water injection/production allocation strings, the prefabricated cable automatic measurement injection column is optimized for subdivision water injection operation and the electric control fine distribution production process string is optimized for fine distribution production operation. In view of the layes with obvious change of permeability of sand control wells in Bohai Oilfield, the subdivision water injection process and fine distribution production process design can be carried out to form a subdivision water injection/production allocation process scheme suitable for Bohai Oilfield.