This investigates and analyzes the geological environment conditions of Ganzixi bank in Three Gorges reservoir area. It points out the typical of bank is an earthy one. According to some principles, the typical collapses of the bank can be classified into (1) washing and abrasion type and (2) slope type. At the same time, the paper also discusses the methods of getting forecasting parameters, calculates the stability of the land in the different cases. The results show that three engineering geological cross-sections are less stable in the case 6, but stable in other cases. The scope of bank collapse prediction is in line with the actual data.