Four typical coherent integration methods are selected and applied to radar moving target detection according to the transformation of radar moving target signal to realize coherent integration, which are Short Time Fourier Transform(STFT), Wigner-Ville Distribution(WVD), Smoothed Pseudo Wigner-Ville Distribution(SPWVD) and Fractional Fourier Transform(FRFT). The effects of sampling frequency, pulse number, input Signal-to-Noise Ratio(SNR) on coherent integration performance and moving target detection performance are emphatically studied. The result shows that the FRFT is relatively slow but has a wider application range, and it can effectively suppress noise when dealing with signals with strong background noise. It has high parameter estimation accuracy and good time-frequency clustering, which provides theoretical support for engineering application of radar coherent integration detection.