Based on the precipitation data, socioeconomic, geographic topography and water conservancy facilities in Jinghai District of Tianjin City from 2009 to 2018, the risk factors of disaster causing factors, the sensitivity of disaster sensitive environment, the vulnerability of disaster bearing body and the ability of disaster prevention and reduction were analyzed, respectively. The risk assessment and zoning of rainstorm disaster in Jinghai area were carried out by using GIS technology and statistical method. The study found that the risk of rainstorm disaster in Jinghai District of Jinghai city was evaluated and zoning. There is a higher risk in the northern part of Jinghai district and in the Zhongwang town and its surrounding areas, while the risk in the central part of Jinghai is relatively low. The high risk areas of rainstorm are mainly distributed in the Jinghai town and Liangtou town and its surrounding areas with the sensitivity of disaster causing factors, the high vulnerability of the bearing body and the low ability of disaster prevention and reduction, and the construction of disaster prevention and mitigation facilities should be strengthened.