The self-pumped phase conjugate mirror(PCM) feature using the stimulated Brillouin scattering(SBS) phenomenon has great application value in improving the laser phase distribution and the energy concentration of the spot. Based on the phase conjugation characteristics of back scattered SBS light, the influence of different degree of distortion and different sampling aperture on SBS-PCM correction was numerically simulated. The SBS-PCM wavefront distortion compensation system was established to verify the compensation effect of different influencing factors. The simulation and experimental results show that under the condition of weak distortion, the spot distortion is more uniform and regular than the strong distortion after compensation, and meanwhile spot energy concentration is higher. In the case of strong distortion, large sampling aperture shows the advantage of better correction. Simulation and experimental results show that SBS-PCM has strong wavefront distortion correction capability.