Abstract: Bohai Oilfield was 40% developed by horizontal wells. In order to maintain steady production of 30 million tons in Bohai Oilfield, the water control, steady and production of horizontal wells are very important components. Aiming at solving the problems such as rapid rise of water content of horizontal production wells, uneven water absorption and output of horizontal wells, difficulty of advantage seepage channel plugging of horizontal injection and mining well group and unsatisfactory effect of traditional horizontal wells profile control, the horizontal injection wells balanced water injection technology is proposed to overcome the shortcomings of insufficient pertinence of the traditional horizontal wells general flooding control and realize the purpose of water injection balanced development and finely profile control of horizontal wells in Bohai high water content field, which shows good application effects and is a new technique to improve the horizontal wells development of offshore oilfield.