Abstract: The risk assessment and regionalization of torrential flood disasters are the important basis for the management and decision-making, which could provide effectively guidance for the prevention and control of torrential flood disasters. According to investigation and evaluation project of torrential flood disasters from 2013 to 2015, the risk assessment indexes were established in consideration of rainfall conditions, underlying surface, population conditions, economic property and other multiple parameters and corrected by disaster resilience. With the weight of each indexes determining by the Analytic Hierarchy Process (AHP), the hazard, vulnerability, risk distributions map of torrential flood disasters in Chongqing were overlaid by the means of ArcGIS. Through the multiple target layer composite overlay and non-supervised cluster analysis, the risk distributions map was divided into five categories: micro risk, low risk, medium risk, medium to high risk, and high risk with the area ratios 14.97%, 25.19%, 24.41%, 22.2% and 13.23%, respectively. Accordingly, the torrential flood disasters in Chongqing was divided into six areas: the medium to high risk zonation in the northeastern high altitude mountainous regions (1.42 km²), the low to medium risk zonation in the northeastern medium altitude mountainous regions (1.12 km²), the high risk zonation in the southeastern medium altitude mountainous regions (1.69 km²), the low risk zonation in the central low altitude mountainous regions (2.07 km²), the micro to low risk zonation in the central low hill regions (0.59 km²) and the medium to high risk zonation in the west hill-flatland regions (1.34 km²), which objectively reflected the regional differences of the torrential flood disasters characteristics, distribution, proneness, and urgency.