The use of the ground-based GPS observation technology for estimating precipitable water vapor (PWV) is a brand-new technique developed in the 1990s. An efficient data communication network can help download data in real time and control the GPS receiver remotely and provide the essential technical support for the operational use of ground-based GPS data. The GPS communication and remote control system was developed by using a modem and the public switch telephone network (PSTN). Adopting the dialing approach, the system configures the GPS receiver specified by the GPS water vapor remote sensing network and downloads the data stored in the receiver. The application of this communication system can enhance the maintainability of the system and facilitate the operational application of the GPS water vapor remote sensing network. However, there are still some problems in the system needed to be solved such as low speed and manual control.