In the purpose of capturing the Beidou satellite signal faster, more accurately, more stably, a new FFT pseudo-code parallel acquisition algorithm for extracting at mixing front-end is proposed. Compared to the traditional FFT algorithm, firstly, extracting the sampling data which makes the FFT calculation points reduced to 1/5; Secondly, accumulating the results of IFFT according to a certain period of time before the square detection; Lastly, getting the correlation peak by decision. It is showed that using this algorithm can effectively reduce the FFT computation, minimize the system complexity and shorten the signal acquisition time. And what is different form the FFT algorithm only by extracting, the capture accuracy has significantly improved. The superiority of the proposed method is verified in simulations.