Currently, water resources has become one of the factors to restrict the economic development of Jinhua City, it also limited the growth of Jinhua City''s population．On the basis of qualitative and quantitative research for the carrying capacity of water resources in Jinhua City, and in the light of characteristics for Jinhua City''s population growth, using the grey prediction model, the paper predicted and analyzed the suitable population capacity in Jinhua City, which adapted to the city development. It is found that the population capacity in Jinhua City will be exceed the water resources carrying capacity. We put forward some basic measures, as controlling the size of the population; protecting water resources and water environment; improving the water utilization efficiency; constructing the new water-saving city and so on. The measures can supply some reference for the future development of Jinhua City.