Abstract: An augmentation reference station network RTK positioning software (ARSNet) package has been developed and tested at Southwest Jiaotong University (SWJTU) to provide high-precision RTK positioning service. This software system is currently in operation on Sichuan integrated GPS reference station network in Sichuan,China. Data processing strategies for the ARSNet system,including real time data checking,integer ambiguity parallel filtering with a sidereal filtering to mitigate multi-path as well as tropospheric delay modeling were presented and tested. It shows that the RTK positioning accuracy is better than 2 cm in the horizontal direction and 4 cm in the vertical direction within the area of network coverage.