Abstract: Karst collapse hazard zoning around West Lake is an important aspect of urban geological harzard analysis and evaluation, which is a part of urban geological data management and service system for the Hangzhou city. In the model of the karst collapse hazard zoning, the analytic hierarchy process (AHP) is introduced to get the weights of individual contributing elements, based on the advices of project geologists before group decision-making. The most compatible weights of contributing elements are obtained by considering the geologists weights during process of decision-making, based on the principle of individual analyses and coefficient variations. Weight results of AHP are fully utilized in this model, which avoids the extreme weights by a few geologists. Hence, the results seem to be more reasonable than those of the conventional method. Zoning results show that the development of karst collapse harzard and the geological structure are two main important elements that affect karst collapse hazard around the West Lake, which is quite well accepted by most of the experts. Although there is no distribution of the most risk area, the government should take attention to more susceptible and sub-susceptible area which could be potentialy hazard collapse area more seriously, especially when the area is considered as an engineering site.