To suppress the spatial mismatching and the phase-shift error in dynamic interferometer, the phase correlation algorithm and carrier squeezing interferometry are used respectively. The former takes the edge of test beam spot as the match characteristics to achieve the matching precision with pixel level of 4 phase- shift interferograms in space by registrating the test spot. The latter achieves separating the phase lobe and the error lobe in Fourier spectrum through the rearranging of 4 carrier phase-shift interferograms, therefore the phase error can be suppressed by extracting the phase lobe. The experimental result shows that the mismatching error and the phase- shift error are suppressed well by the two techniques, and the corrected result accords with the interferometer, where the differences between their root-mean-square value and peak-to-valley value are 0.0057 λ and 0.0235 λ respectively. The phase correlation algorithm is not affected by factors such as intensity distortion, and the carrier squeezing interferometry can also suppress the phase error whose spatial frequency is twice the fringes caused by phase-shifting devices and phase error with the same spatial frequency as the fringes caused by the intensity distortion error.