The situation in land degradation has become serious in the west of Liaoning province during the recent decades,and many districts have become ecologically vulnerable areas.The mesoscale model (MM5V3.5) was used to simulate the changes in temperature,sensible heat flux and latent heat flux by means of changing landuse according to the survey data about the land degradation in the west of Liaoning,and using the data in June,2001.Results show that the monthly averaged temperature of June will raise by 0.1～0.7℃ and monthly averaged surface temperature of June will raise by 0.3～1.3℃ at the degradation land area;the sensible heat flux will increase,while the latent heat flux will reduce after the underlying surface state being changed.