In order to reduce the carrier frequency error of the processed interferogram by using the Fourier transform method, and accurately recover the laser phase to be measured, we propose a phase retrieval method based on the propagation property of Gaussian beam. On the cross section of the Gaussian beam along its direction of propagation, the phase of the beam is a symmetrical convex or concave surface. The curvature of the convex or concave surface is related to the propagation distance. According to this property, the size of the carrier frequency is calculated and the phase to be measured is finally restored. In theory, the size of the carrier frequency can be calculated accurately, and the phase to be measured can be restored with high precision. Both numerical simulation and experimental results show that the proposed method can accurately recover the phase to be measured.