According to the rare existing researches of RDSS position service of satellite navigation system, this article evaluates RDSS position service performance using the time series analysis method based on Beidou original data. Firstly, we study the RDSS position principle and the evaluation method systematically. Moreover, based on placing the user terminal at different stations such as Beijing, Sanya, Shantou, Kashgar and Urumchi, we evaluated the position performance of different areas on the accuracy analysis of east-west, south-north and plane. The results provide the reference for the position consistency of Beidou system.