Due to the relatively high viscosity of the injected chemical solution and high flow resistance，the test shows that the liquid production index in the polymer/viscosity reducer flooding after the injection of the chemical agent generally decreases compared with that in the water flooding stage，and it is difficult to meet the preset requirements. At present，there is no feasible method to predict the liquid production capacity in the polymer/viscosity reducer flooding，which seriously restricts the application of chemical flooding technology in heavy oil reservoirs in Shengli Oilfield. Based on the mathematical statistics and reservoir numerical simulation methods，a numerical simulation model is first established by taking Block Ng3-4 in the eastern part of Gudao Oilfield as an example. Then，the effects of factors on dimensionless liquid production index are investigated. Finally，a quantitative characterization model for the dimensionless liquid production index is established based on the simulation results，and the dynamic methods for the liquid production capacity in the polymer/viscosity reducer flooding are formed. The research results show that the quantitative characterization model for the dimensionless liquid production index is concise in mathematical form，and the meaning of the uncertain coefficients in the model is clear.The proposed dynamic prediction method can better fit the dynamic field data.