Abstract: The allocation, function and characteristics of SCADA system in natural gas pipeline project of Jiangxi Province are described. The SCADA computer system in dispatching control center supports the distributed multi-server frame. The hot-redundant configuration is allocated by server and LAN, and GPS clock is set to provide the time base. The duty of station system concludes monitoring task, data transmitting to the dispatch control center and accepting or implementing its orders. While the RTU system is responsible for transmitting data to the dispatching control center or nearby station, accepting and implementing the dispatching control center's orders. The data flows are designed reasonably in order to ensure the accuracy and security of data. Furthermore, the accuracy and uniqueness of the raw data, the timeliness and effectiveness of data transmission are guaranteed by expanding interfaces and functions. The station control system and RTU system are connected into a ring by communication optical fiber. At the same time, the 2M SDH point to point data lines between the dispatching control center and each station control system has been configured. Then the security and stability of SCADA system have been improved.