Abstract: Simulation of water and fertilizer movement in different conditions of variable rate fertilizer urea application have been carried out in this paper.The equation of surface flow motion and convection-dispersion equation of solute transport is used as the govern equation to establish a model to simulate the movement of soil water and fertilizer for variable rate fertilizer urea application under border irrigation.Using this model,the movements of 3 different top application (straightline-decreasing type,parabola-decreasing type,uniform type) were simulated and analysed.The results show that the power function model parameters between the concentration of urea and infiltration time are affected by the distribution of urea,the larger the initial concentration changes, the larger the parameters change;the fertilization uniformity of 3 different top application:straightline-decreasing type>uniform type>parabola-decreasing type.Therefore,the type of top application has a significant influence on the movement of water and fertilizer,the straightline-decreasing type can get ideal fertilization quality.