[Objective] We carried out an assessment and regionalization of torrential flood disaster in Chongqing City to provide the corresponding reference for disaster prevention and mitigation of torrential flood.[Methods] According to the related theory of natural disaster, we established a risk assessment model of torrential flood disaster in Chongqing City with four assessment index subsystems, containing the dangerousness of disaster risk, the vulnerability of the disaster environment, the exposure of the disaster bearing body, and the ability of disaster prevention and reduction. Based on the meteorological, ecological and social economic data of Chongqing City, the assessment and regionalization of torrential flood disaster risk in Chongqing City were carried out by using the GIS spatial data analysis.[Results] The highly risk regions of the torrential flood disaster-causing factors is located in most areas of Hechuan and Jiangjin area. The highly vulnerable areas of disaster-prone environment are mainly located in the river valley along the Yangtze River and Jialing River. The exposure of torrential flood disaster bearing body is higher in Nanchuan, Wulong, Fuling and Chengkou City. The low disaster prevention and mitigation capacity areas lie in northeastern and southeastern part of Chongqing City.[Conclusion] The highest risk area of torrential flood disasters are largely located in Wuxi, Youyang, Pengshui, Jiangjin and Hechuan area.