The correlation coefficient of two wavefronts is proposed to describe and estimate the adding result of low-frequency phase aberration. Both the simulation and the experiment of low-frequency phase error adding propagation prove that the correction coefficient can efficiently be used to estimate the result of phase addition. Based on the result, a new kind of phase correcting methodphase self-correcting method is put forward, to properly choose and set the disk amplifiers in the high-power solid-state laser facility. The model to carry out the self-correcting method in high-power laser system is given.