Abstract: Aiming at the problem of analyzing the accuracy of the dual-frequency and triple-frequency combined SPP positioning of the Galileo system, this paper analyzes the dual-frequency and three-frequency combined SPP positioning accuracy of the Galileo system based on the measured data of the Galileo MEGX tracking station. It is found that the Galileo system E1/E5a and E1/E5b dual-frequency combination SPP positioning accuracy is higher, while the E5a/E5b and E1/E6 dual-frequency combination SPP positioning accuracy is too poor, not suitable for positioning. There is significant improvement in positioning accuracy of the three-frequency SPP than the dual-frequency combination. The positioning accuracy in the X and Y directions is better than 0.8 m, and the accuracy in the Z direction is better than 2.3 m, which can provide a certain reference for future research on the multi-frequency combined positioning of the Galileo system.