The soil adsorption model and immobile water model were established through experiments of isotherm static adsorption and dynamic adsorption,and hydrodynamic dispersion in saturated soil respectively.The numerical model of the characteristic method combined with finite element scheme (CMFE) was proposed to solve the mathematical model of solute transfer through saturated-unsaturated soil under the influence of soil adsorption and immobile water conditions.The solute transport were simulated by the CMFE method under evaporation and infiltration experiment conditions.A comparison among the mathematical models considering the following four cases respectively:(i) neglected influence of soil adsorption and immobile water,(ii) soil adsorption only,(iii) immobile water only,and (iv) both influences of soil adsorption and immobile water was done systematically.It was shown that the influences of soil adsorption and immobile water on solute transport were very large and could not be neglected in the soil water-salt control and monitoring,in the research of salinized soil,and in the accurate and quantitative research.