Abstract: The application of telegraph technology during the Republic of China promoted the realization of weather forecasting services. As the most advanced communication tool at that time, the telegraph accelerated the reception of meteorological observation data and the speed of meteorological information dissemination. The arrangement and specification of meteorological codes and broadcast codes played an important role in the initial establishment of the weather forecast service in China. Through the analysis of the historical data of the relevant archives of the meteorological telegraph during the Republic of China, the formation of the Meteorological Telegraph of the Republic of China and its interaction with the development of the weather forecast business can be clarified.