In response to the strategy of sustainable development of our country, we carried out the prediction analysis of water resources carrying capacity (WRCC) for Zhoukou City, in order to find a scientific solution for the local water resources problems. System dynamics technique was employed to the modelling of the WRCC of Zhoukou City to simulate and predict its dynamic changes from 2018 to 2030. Four scenarios of maintaining the status quo, saving water, finding new resource, the combination of saving water and finding new resource were established with the model under different water-saving and water diversion schemes, and then the corresponding changing trends under different scenarios were compared. The results show that the optimal solution is the combination of saving water and finding new resource, followed by the comprehensive water-saving scheme in the scenario of saving water. Therefore, paying attention to water-saving, especially agricultural water, can greatly reduce the demand for water in Zhoukou City. Two policies of water diversion and water-saving can effectively improve the WRCC of Zhoukou City.