How to improve the acquisition speed and precision of satellite navigation positioning P-code is one of the hot issues in military receiving technology research. Based on the GPS P-code extended replication overlap (XFAST) acquisition algorithm and the mean acquisition algorithm, an acquisition algorithm based on time-frequency fusion is proposed.Through XFAST processing to the local sequence, the search area is expanded without affecting the degree of correlation. Then averaging is made to the processed local sequence and the received sequence, thus to reduce the amount of computation, and to achieve the purpose of improving the capture speed. The feasibility of the algorithm is analyzed, and the specific process of the algorithm is presented. The simulation results verify the effectiveness of the proposed method.