Abstract: In sandstone reservoirs which were during the medium and high water cut stages,high-capacity channels might take place after long terms of water flooding,which made the circulation of water flooding very inefficient,and further reduced exploration efficiency and recovery rate.A case study was carried out in the Gaotaizi Reservoir of the Honggang Oil Field.The influencing factors for the generation of high-capacity channels were studied.Porosity,permeability and water content ratio were chosen as static or dynamic indexes to calculate high-capacity channel parameter by confirming the weight of each index.Based on the above-mentioned modeling indexes,a three-dimensional model for high-capacity channels in the study area was set up so as to illustrate the generation and distribution of high-capacity channels in reservoir and to provide geologic basis for future oilfield development.This new method provided direction for the research on large pores,and was significant for the study of other similar reservoirs.