Based on the observational data and ground encryption automatic station data of Jiangsu, Weather Research and Forecast model (WRF V3.6.1) with different land use data and two urban canopy schemes is used to simulate the high temperature weather case of Jiangsu in 2014, and to assess the influence of urbanization process on temperature and its possible mechanism. The conclusions are summarized as follows:(1)The BEP test can better similar the distributions of air temperature at 2 m, 2 m relative humidity and 10 m wind speed. (2)the land use data of MODIS can more truly response surface type distribution of the current research area, and can improve the simulation of spatial distribution of surface wind speed,temperature and relative humidity than the land use data of USGS. (3) Compared with the UCM single-layer urban canopy, the BEP urban canopy scheme can better simulate the urban heat island effect and the corresponding surface sensible heat flux and ground heat flux during the daytime by analyzing the energy balance processes of land surface of different experiments.