Abstract: The 10-layer wind speed data collected at five meteorological towers with 100 m height in Urumqi were used to analyze the characteristics of the seasonal variation and diurnal variation of the wind speed in center and suburbs of Urumqi.The results show that:(1) The maximum value of wind speed appears at 14:00-16:00,and the minimum value appears at night or in the morning.The maximum (minimum) wind speed is in summer (winter).The wind speed in winter is relatively low and stable with small fluctuations.The wind speed change in summer.(2) The wind speed fluctuation is the strongest in summer,and the fluctuation decreases with terrain.The maximum fluctuation is in south suburb (1.5-6.4 m·s^-1),while the minimum is in north suburb (1.3-4.6 m·s^-1).The fluctuations in autumn and spring are followed.The fluctuation of wind speed is the weakest in winter,and the maximum is in south suburb (1.3-4.6 m·s^-1),and the minimum is in north suburb (0.7-2 m·s^-1).(3) The wind speed changes little with the height in 0-100 m surface layer in center and north suburb,especially in winter.The wind speed increases from 1 m·s^-1 to 4 m·s^-1 in 0-100 m surface layer in south suburb.The air flow is dragged strongly by the buildings when it is close to the ground.The wind speed near the ground in center is significantly lower than in suburb,and the differences are 5%-32% in spring,8%-30% in summer,15%-37% in autumn,14%-48% in winter.(4) Generally,the wind speed profiles are according to logarithmic function under near neutral stratification.While,the logarithmic function is not significant at noon.

Key words: atmospheric boundary layer, wind speed, profile, Urumqi