Abstract: The efficiencies of water flood pump and pipeline net- work are key to affect the efficiency of water flood system. The efficiency of water flood pump can be improved by the reasonable matching of rated pump pressure,displacement and practical demand,while the efficiency of pipeline net- work can be improved by reducing pipeline throttle and rea- sonably arranging well pattern.In recent three years,the ef- ficiency of water flood system in Shuanghe oil field has been enhanced step by step,forming a set of technique to enhance the water flood system efficiency suitable to Shuanghe oil field.