对半导体激光器的非线性失真进行了理论分析．得出了计算二阶失真和三阶失真的理论公式．实验验证了理论结果，并发现国产ＤＨ－ＧａＡｌＡｓ半导体激光器的二阶失真严重，而三阶以上的失真却可以忽略． The nonlinear distortion of the semiconductor laser is theoretically analyzed. The theoretical formulas for calculating second-order distortion and third-order distortion are obtained. The experimental results verify the theoretical results and find that the second-order distortion of the domestic DH-GaAlAs semiconductor laser is serious, but the third-order distortion is negligible.