In this paper, a high-power network model is constructed. The standard Loran-C waveform can be synthesized by striking the network with a current source. This paper analyze the synthetic principle of the leading and lagging edge of the standard Loran-C waveform respectively, then simulate the input/output characteristics of the network model in different resistance conditions. According to the calculation and simulation results, the network parameters and the appropriate antenna resistance characteristics are proposed. The theories and simulation results in this paper support the Loran-C transmitter system engineering development.