Abstract: Searching fracture-water in bedrock still is an important project, of this project, to define the water-collective preferred faults is fundamental. In order to solve the problem, this thesis expounds the process that how the hierarchic analysis is applied to search water-collective preferred faults and then to sort them into hierarchies. This process has two premises, which are to classify the fault based on its function to collected water or not and to set up the faults' preferred indexes, The process is divided into five steps, which are to set up the structure model for hierarchic analysis, to construct estimation matrix, to rank the indexes in one hierarchy and to check the matrix's consistency, to rank the indexes in all hierarchic, to rank the faults in all hierarchies. At last, the fault can be sorted into several hierarchies according to their rank and then the water-collective preferred faults can be determined. Thus a new simple and practical method is put forward to quantitatively evaluate the water-collective preferred fault.