The heating effect of urbanization is reflected by the contrast which changes year by year between urban surface air temperature and 850hPa temperature.According to the data analysis on Jinan Qingdao and Nanchang,the heating due to urbanization can be reflected by using this method.The heating tendency quotiety of urbanizatian of the three cities are 0.0294℃ /year,0.0220℃ /year and 0.0062 ℃ /year separately.