Using the vertical measurement data of urban and suburb in kunming which located at low-latitude plateau,the characteristics of vertical distribution of city climate at low-latitude plateau city were analyzed.Through comparing analyses,the primary results are as follows:The findings indicate that urban heat island lie in not only near the ground but also upper atmosphere,the intensity of night(influenced height＞ 50 m) go beyond daytime(influenced height＜ 50 m),near the ground exceed upper atmosphere.In urban area,the air temperature decrease with height increasing in daytime and temperature at night is inversion distribution,the center of urban heat island shifts with height increasing.This distribution would have an effect on the diffusion of urban contamination,architecture design and energy saving.