At present, most of the oilfields in China have entered the high water cut stage, resulting in high-energy consumption and high-system handling load.Firstly, this paper introduces the harm caused by high water cut production to oilfield production. Secondly, aiming at the harm, we focus on several common water pre-separation technologies at home and abroad.Finally, we analyze the development tendency of water pre-separation technology.It is believed that with the increase of high water cut oilfields, the high efficiency water preseparation device will gradually develop into thetendencyof the integration, miniaturization, lower investment and cost of various technologies.Combining water preseparation with sewage treatment to reduce the sewage flow will reduce the load of water treatment system, energy consumption and operation cost.