In order to reasonably prevent flash flood disasters in hilly areas of Zhejiang Province, combined with specific examples of the survey, of a total of 133 villages along the river in Tiantai county, Lucheng District of Wenzhou, Yueqing in Zhejiang province was divided into different river channel forms, the degrees of hazard of the villages along the rivers the affected by different river channel forms were analyzed. The villages along the type I river channels had good present flood control ability. Based the basis of combining design flood calculation analysis with the status capability assessment of flood control, the specific hazardous leve classification was given, to supply support for the future mountain flood prevention plan for the establishment, transfer of personnel, temporary shelters, and to provide references for flash flood prevention works of other hilly areas.