In order to study the polymer used for chemical displacement in Chengdao Oilfield of Shengli Oilfield,experiments were performed to study the shearing retention rate of different concentrations of polymer fluids flowing through ordinary metal felt,hydrophobic metal felt,wrapping wire and other three types of screens under different injecting flow rates.Experiments results show that based on precision of sand barrier,the field sand retention accuracy demand is satisfied with oilfield requirements compared with ordinary metal felt and hydrophobic metal felt,the shearing retention rate of polymer fluid flowing through wire wrapped screen with 0.1mm accuracy is the highest,average value is more than 96%.Under the same accuracy,the viscosity retention rate of hydrophobic metal felt screen is much higher than that of ordinary melt felt screen.In combination with special offshore oilfield conditions,coating hydrophobic metal felt screen is recommended.