Abstract: In order to master the water control performance of floating plate water control valve, numerical simulation calculation is carried on to research the water control effect under the conditions of water, different viscosity oils and different water cut water-oil mixtures. Also the water control effect is verified through production performance of high water cut oil field. The results of floating plate water control valve show obvious water control effect. Numerical simulation calculation provide effective analysis and evaluation means of water control valve, also provide effective means and guarantee for R & D and evaluation of new water control products.