The collection rate of water fee and the leakage rate of pipe network are mutually promoting and influencing. Higher water fee collection rate can provide more economic support, which enables the water department to strengthen the maintenance and transformation of the water supply pipe network, thus reducing the leakage rate of the pipe network. On the other hand, by reducing the leakage of the pipe network, the water supply cost can be reduced, the water supply efficiency can be improved, and the water fee collection rate can be improved. The water fee collection rate is positively correlated with the leakage rate of the pipe network, which promotes and influences each other. Increasing the collection rate of water charges and reducing the leakage rate of pipe network can realize the sustainable development of water supply system. Water fee refers to the fees that residents, enterprises, institutions and other users need to pay for using water services such as tap water, sewage discharge and sewage treatment. The water fee shall be determined by the water supply company, water department or relevant management institutions according to certain pricing rules and the guidance price of relevant government departments.