With the aid of Object-oriented design and a new programming language——Java, a physicallybased model of hydrological-saline processes in soil was built on the basis of salt and water balanced model and mechanism model.This model is a daily-time step, multiple-layer model of soil water-salt balance.As a case study of the model, hydrological dynamics of soil in Changling, Jilin province was simulated with results verif ied to be consistent with the observed soil moisture data in 1997.The dynamics of salt, alkaline and pH was simulated on two types of soil in 1997, with Aneurolepidium chinense and Suaeda corniculata growing on it respectively.Comparing with the experimental data, the simulation results can express the dynamics of saline and alkaline in different seasons.