As one kind of the major geological disasters

191ground fissures with different cause and scale have developed in the Weihe River Basin

Shaanxi Provice and they have caused serious economic losses.First of all

the geo-environmental background

the causes

classification and characteristics of the ground fissures in the study area of Weihe River Basin were analyzed and evaluation factors were selected.According to the characteristics of the evaluation model

a reasonable index quantification method was selected and the method of AHP was used to determine weights of the indices

therefore

the ground fissure index system of hazard assessment was set up;then as a platform of ArcGIS software

all layers of graphic information and attribute information were collected

the 300m×300mevaluation unit was used

the crack disaster spatial database was established

and the spatial analysis functions of query analysis

overlay analysis and buffer analysis for the study area were established.The mathematical model of hazard assessment（multi-level fuzzy comprehensive evaluation method）of the ground fissures in study areas was determined;Finally

the study area ground fissure disaster hazard degree zoning map was generated

using raster overlay operations.The study area is divided into four grades—mild（I）

moderate（II）

moderate in height（III）and high（IV）

and the dangerous area of the ground fissures partition map is matched to the actual status of the investigation.