Abstract: Climatic characteristics of wind energy resources in China are closely related to Chinese monsoon climate and the three-step terrain with high-lying west and low-lying east. Based on the high resolution simulated winds and the in-situ winds measured from masts,the climatological analysis show that（1）the abundant wind energy resources over the"Three Norths"regions in China mainly benefit from contributions of the strong winter winds and active northern cyclones in spring,and（2）wind shear index in the plain area is larger than that in the coastal areas with a relatively smaller index over inland mountain areas. In addition,a two-dimensional division method of available wind energy resources is established. Then the distribution and technical potentials of wind energy resources are assessed using the two-dimensional division method as well as the configurations of wind turbines widely used in China. The estimates of the onshore wind technical potentials for China show that 3200 GW,3900 GW,4600 GW and 5100 GW of installed capacity could be harnessed at 80 m,100 m,120 m and 140 m,respectively,and the offshore wind technical potentials at 100 m are 210 GW and 190 GW at 5-25 m and 25-50 m water depths. The technical potential at 140 m ranked as the most abundant and abundant level is 800 GW higher than that at 100 m,which is mainly distributed in Inner-Mongolia,Gansu and Xinjiang provinces.