Abstract: Taking the plain area in Liaoning province as example,This paper establishes a mathematical model for groundwater system in typical area,presents a variable hydro-geological parameters simulation method about the equivalent permeability coefficient of aquifer and average specific yield,and shows an improvement about the routine zoning method,which is used in the constructed model to increase the precision of the model.We use the modified finite element method to numerically discrete to the model,and establish the calculation program by using Visual Basic.The simulation result is better for the groundwater1 The constructed model provides condition for the research of the sustainable utilization of groundwater in the plains in Liaoning province.This method provides significant reference for the model research on similar area.