This paper presents a novel laser Doppler shift measurement method. The propoed method uses the amplitude and phase of the phase-modulated beat signal as independent variables to define a new function and uses the function as a Doppler-shifted frequency-discriminating parameter. The purpose of the proposed method is to combine the two phase-modulated laser Doppler frequency shift measurement methods. In theory, the frequency-discriminating curve, the sensitivity curve and the error curve of the proposed method are respectively compared with the corresponding curves of the two types of phase-modulated methods. It is found that the propoed method not only inherits the working mode of the phase-modulated beat frequency signal amplitude method to measure the small frequency shift amount, but also absorbs the measurement ability of the phase-modulated beat frequency signal phase method to obtain higher measurement sensitivity and dynamic range. The hard-target reflected frequency-shifted controllable signal light is measured. The experimental results not only prove the correctness of the theory, but also prove that by adjusting the translation parameters, the dynamic range of the new method can be improved by about 26.8%, which is more suitable for measuring the high Doppler frequency shift.