By using the data observed in 17 February—2 March 2006,the turbulent characters of nondimensionalization wind velocity(u,v and w),and air temperature at the urban and suburban sites in Nanjing are analyzed and compared to the results of other sites observations.In addition,the applicability of M-O similarity theory is validated over urban and suburb.Results show:the standard deviation of dimensionless fluctuating wind velocity(u,v and w) varies with the 1/3 power of the stability with some differences over urban and suburban,the deviation in vertical is smaller than in horizontal,especially in non-neutral stratification.The normalized standard deviation of temperature increases with the stability decreasing,with some differences over urban and suburban underlying surface.Under unstable condition,the standard deviation of temperature varies with the-1/3 power of the stability over urban but 2/3 power over suburban,under stable conditions,the -1/3 power of the stability over urban can be found but no universal relationship over suburban.