Abstract: Using MM5 and CALMET the wind speed and wind power density in the height of 10,30,50 and 70 m in Beijing regions were simulated.Results showed that:geographical distribution of wind speed and wind power density in each height level was consistent,wind speed in northwestern Mentougou was the greatest, western Changping, northern Fangshan and western Yanqing were followed,and the least wind speed located in Shunyi and eastern urban areas.The simulation results of wind power density revealed that the wind energy resource was more abundant in the western and northern Beijing,while which in eastern,southeastern and northeastern regions,as well as sounding urban areas,was relatively indigent,and the exploitation potential was lower in there.Furthermore,validating the simulation results by using the observational data of three wind towers and three meteorological stations,showed that MM5 and CALMET could simulate the monthly and daily variation of wind speed basically,and it had a better correlation between the simulation and observation,but it had a bit systematic errors.Simulation values were larger in Huangcaoliang and Beiliang regions,while they were smaller in Jiangou region,this might be affected by complex terrain and limitation of model resolution.