Abstract: Based on the properties of low liquid producing and low oil production in offshore Chengdao Oilfield of Shengli petroliferous province, liquid lifting was researched on.Using the methods of reservoir engineering and numerical simulation, liquid lifting potential, opportunity and qualifications of the reservoir were studied and confirmed.The results show that the reservoir has the potential of liquid lifting, and good lifting effects can be got when water cut is 70%~80%.The precondition of liquid lifting is restoring formation pressure to 0.85 times as much as initial pressure, rate of injection and production is 1.1, and the max production pressure is 3.5 MPa.The practice has provided an effective way for the increasing production of the reservoirs and also provides positive references for improving similar offshore oilfield water flooding development effect.