建立的水环境承载能力计算模型应该包括以下几部分：一是，城市污染物排放量计算；二是，水体水量—水质—生态耦合模型；三是，生态系统良性循环控制目标方程。由这三部分模型方程组合成为“水环境承载能力计算模型”。根据水环境承载能力计算模型求解，可以得到“城市水环境承载能力”大小。-Establishment of water environment carrying capacity calculation model should include the following parts: First, urban pollutant emission calculations　Second, water quantity- Water Quality- Eco coupling model　Third, ecosystem virtuous cycle control objectives equations. This three-part model equations by the combination of a " water environment carrying capacity calculation model."　According to the water environment carrying capacity calculation model solution, you can get " urban water environment carrying capacity"　size.