Abstract: In recent years, lightning disasters have occurred frequently in Suzhou.The regional differentiation classification of lightning disaster risk in Suzhou can provide reference for lightning disaster prevention.Based on the three-dimensional lightning location system data, elevation data (DEM ) and soil conductivity data of Suzhou City from 2016 to 2020, the grid data of 1 km ×1 km was formed by normalization processing.The five indexes of ground flash density, ground flash intensity, soil conductivity, altitude and topographic relief were selected to conduct risk analysis for the lighting disaster-causing factors in Suzhou City.The standard deviation classification method was used to classify the risk area of disaster-causing factors.The results show that the high risk is concentrated in the northeast of Changshu City and the northwest of Taicang City; the sub-high risk is distributed in the east of Huqiu District as well as the east and south of Wuzhong District; the medium risk is distributed in the north of Gusu District; the sub-low and low risks are concentrated in Kunshan City, the eastern Wujiang District and the Taihu Lake area (western Wuzhong District).