Combined the former research results, interrelated new statistical data and opinion of some experts together, via investigation and argumentation, based on the goal of suitability analysis of riverbank water-source, the paper chose four determinant facts that included stability, depth, current velocity and using status of water-front resources, and laid down the primary process and step of riverbank evaluation. The evaluation of the four determinant factors are completed by GIS tools, statistic methods and synthetic analysis. Based on the predigested AHP, it evaluated the suitability of riverbank water-source in Nanjing section of the Yangtze River and got primary results which has better combination with interrelated plan.