Taking Zhengzhou City as an example, the calculation method of urban water environment carrying capacity is introduced, and the carrying capacity of the water environment in the current level year (2001) and planning level year (2010 and 2020) of Zhengzhou City is calculated. According to calculations, the carrying capacity of the water environment in the current level of Zhengzhou City (2001) was 0.668 6×108 m3, and in 2010 and 2020, it was 4.295 3×108 m3, 8.331 6×l08m3. According to the analysis of factors affecting the carrying capacity of the water environment, suggestions for regulating and countermeasures to improve the carrying capacity of the water environment in Zhengzhou are given