Abstract: An interactive model between land surface physical process and atmospheric boundary layer is established, and is used to simulate the features of soil environmental physics, surface heat fluxes, evaporation from soil and evapotranspiration from vegetation and structures of atmosphere boundary layer concerning the grassland underlying suface. The sensitivity experiments are engaged in primary physics parameters. The results show that this model can obtain a reasonable simulating for the diurnal variations of heat balance, soil volumetric water content. resistance of vegetation evaporation, flux of surface moisture, and profiles of turbulent exchange coefficient, turbulent momentum. potential temperature, and humidity mixing ratio. The model developed can be used to study the interaction between land surface processes and atmospheric boundary layer in city regions, and it can also be used in the simulation of regional climate incorporating a mesoscale model.