Water conservancy modernization is the foundation and guarantee for economic and social mondernization .In order to objectively evaluate the level water conservancy modernization in Xuzhou,the paper put forward an evaluation index system and dividing standard of modernization stage.It picked up 4 mian components from 27 indexes by use of the main components analysis,and analyzed the main components every region by means of entropy ,and ranked the modernization current situation and level of water conservancy every region in Xuzhou.The result indicated that evaluation results of PCA-Entropy method are in accordance with the fact and reasonable .The research extended the index system of water conservancy modernization and provided a kind of new thought and way for evaluation of Xuzhou water conservancy modernization.