In order to study the water resource carrying capacity in Jiangsu Province,the paper applied the system dynamics to build the system dynamics model of water resource carrying capacity in Jiangsu Province. It designed four methods to simulate the level of water resource carrying capacity of Jiangsu Province from 2013 to 2020. Supply-demand difference and COD emission were selected as the evaluation indexes to evaluate the water resource carrying capacity of Jiangsu Province. The results show that the water resource carrying capacity of Jiangsu Province can not meet the needs of social economic development in recent years. The fourth method can effectively solve the contradiction between supply and demand of water resource in Jiangsu Province. Finally,it put forward to the countermeasures to solve the insufficient of water resource carrying capacity of Jiangsu Province..The countermeasures are to made full use of science and technology, and comprehensively considered opening resource , saving water, the adjustment of industrial structure and water pollution control.