The existing Yangtze River estuary model control system upstream of the amount of water weir plus twisted channel for flow control, the downstream use of tidal tank and tailgate for tide control, data collection using 485 wired communication. In this paper, the design of the control system for the aging of the original control system is very difficult to control the flow time, and the design of the 485 cable communication equipment is more difficult. Considering the complicated large tidal river model, the complicated boundary condition of the river, and combined action of the runoff and tidal current on the tidal river mouth, an in-depth study of the model layout and the automatic control system is carried out. The network technology, wireless communication technology and the modular design is successfully applied to the control of the Yangtze River estuary model, modules such as water supply, runoff control, and downstream tide control, and a standardized, modular, wireless, intelligent and remote control system is composed of. Experimental results show that the new control system has good repeatability and high control precision, which is higher than the existing specifications. The application results show that the system design of the modular design is convenient and the test equipment of the wireless communication is convenient. The new runoff control system occupies the model the analysis results show that the standardized new control system has good repeatability, high control precision and higher than the existing specification. The control system of modular design is stable and convenient for maintenance. The intelligent and remote control system is easy to operate. The test equipment equipped with wireless communication is convenient, the new runoff control system takes up less model test sites, the test preparation time is short, and the model test efficiency is greatly improved. The system has a very good use value.