Abstract: When an earthquake occurred, leakage phenomena usually occur in water supply network. In order to evaluate the seismic performance of the water supply network, it is necessary to conduct the service performance analysis of the water supply network based on pipe leakage model. The analysis method is presented and discussed in detail in this paper, and a hydraulic leakage model is also built. Through the connectivity analysis and the continuity equation solution, the node flows and node water heads can be obtained, and finally the service performance of the water supply network can be evaluated. In addition, an example of the water supply network is presented to illustrated and discussed in detail. All of above may be applied to practice, such as earthquake design, earthquake damage forecast and earthquake mitigation analysis of practical water supply network.