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The current GPS trajectory positioning methods all use single-frequency positioning, which can not guarantee the positioning accuracy under the abnormal data. Therefore, a research on the dual-frequency positioning method of GPS trajectory data based on Beidou satellite is proposed. Firstly, based on the positioning principle of Beidou satellite, a mathematical model for spatial geometric distance measurement and accurate positioning of ground monitoring points is established, and the weights of the pseudorange and carrier phase observation values are determined. The Beidou satellite is used to determine the spatial geometric distance of the object. And spatial position information; due to the influence of the positioning system itself and the atmospheric ionosphere, the spatial positioning information contains error terms. Based on the Beidou satellite system, the GPS trajectory error term and abnormal data can be corrected to achieve accurate positioning of the target position information. The test data shows that the accuracy of the proposed positioning method is higher, the comprehensive positioning deviation is 0.56%, and the mean and variance control of the positioning error is better.