The invention discloses an analysis and evaluation method for inrush mountain torrent disasters of regions without data, and relates to the field of mountain torrent disaster analysis and evaluation. The method comprises the steps that the basic information of a
project area is obtained; the
landform, the river position form and the
flood control current situation of an evaluated object are obtained; the
catchment area and runoff components of the dike confluence
drainage basin of each small
watershed in the obtained evaluated object are determined; rainstorm parameter calculation, rainstorm calculation and concentration-time-based rainstorm time
interval distribution of the evaluated object are obtained; flood calculation is designed, and the
water level and flow relation of a riverway section, prone to inrush, of the evaluated object is obtained; the riverway
flood control current situation in the evaluated object is determined, and accordingly danger zone grade division is conducted; and an early warning point is established, the early warning
water level of the analyzed and evaluated object is determined, and the early warning index of the analyzed and evaluated object is formulated. According to the analysis and evaluation method, the inrush mountain torrents serves as the main analyzed and evaluated object, and a current riverway
flood control current situation evaluation method and an early warning index
analysis method are provided.