By applying the WRF model to simulate a heat wave event which occurred over Zhongshan in July 2010, the impact of urbanization on heat wave event is evaluated. Two sets of landuse data and anthropogenic heat(AH)estimated by taking into account sources from manufactories, vehicles and residents are introduced into the model. The results show that the control run which uses the new landuse data gives a good performance on the temperature distribution of Zhongshan during the heat wave event, and the urban heat island phenomenon over Zhongshan is evident. The increases of temperature due to the urban land cover and AH are 0.9 ℃ and 0.2 ℃, respectively, and the increase of daily minimum temperature is more evident than that of daily maximum temperature. Both urban land cover and AH can enhance the intensity of the urban heat island over Zhongshan, especially in nighttime, and the change of intensity is largest before sunrise, which is 1.5 ℃ due to unban land cover and 0.6 ℃ due to AH. Urban land cover and AH can enhance the surface sensible heat flux, which leads to the increase of temperature, but the change of heat flux because of urban land cover is much higher than that of AH. Besides, the change of heat flux is more evident in daytime, but the increase of temperature is larger in nighttime.