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With the continuous improvement of the train speed, the interference of the track circuit signal is also more and more complex,how to more accurately detect the parameters of track circuit signal is becoming a more and more important issue. Due to the track circuit frequency shift signal passes control information by frequency parameters. Therefore, through improving spectrum resolutions to improve the signal reliability, combinng the advantage of Zoom Fast Fourier Transform(ZFFT) algorithm based on multiple modulation in the field of signal spectrum refinement, thinking distribution feature of track circuit signal in the frequency domain, the ZFFT algorithm based on multiple modulation is put forword for the credible detection of track circuit signal(FSK singal),this algorithm refines the interesting local signal spectrum in the whole signal spectrum, to improve the spectral resolution power. And verifying by simulation, the simulation results show that the low frequency detected of the frequency shift signal is satisfied with the error standard, and the reliability of the signal detection is improved.