根据给水管网的水力特性，提出了以管段压力及管段流量为求解变量的给水系统优化设计目标函数，并采用优化效果明显的简约梯度法进行计算，结合罚函数法提出了目标函数变换技术，直接解决了求解管径标准化的难题，经实例验证计算效率高，可靠性强。 According to the hydraulic characteristics of the water supply pipe network, the optimization design objective function of the water supply system is proposed, which takes the pipe segment pressure and the pipe segment flow as the variables, and the simple gradient method with obvious optimization effect is used for calculation. The objective function transformation technology is proposed by combining the penalty function method. Directly solve the problem of solving the standardization of the diameter of the pipe, and the example shows that the calculation efficiency is high and the reliability is strong.