针对随机激光器的半经典理论是应用电磁场时域有限差分法数值求解半经典随机激光模型方程组，基于半经典理论数值研究了一维随机激光器中准态模式的饱和特性，获得了不同准态模的空间分布和频谱分布图。计算结果分析显示：准态模式的某些特征参数如局域程度将会影响系统的饱和特性。利用这一结果，可以通过单频抽运方法选择具有低阈值、高饱和强度的准态模式作为整个激光系统的稳态输出模式。

According to semi-classical theory for random laser,the Maxwell equations with the rate equations of electronic population can be solved by Finite difference time domain method(FDTD). The saturation effects of quasi-state modes in 1-dimension random lasers were numerically investigated based on this theory. The spatial and frequency distributions of different quasi-state modes were obtained. The results show that some properties of quasi-state modes,such as localization,will influence the saturation effects of the random laser system. Byinvestigating these effects,the best quasi-state mode with low threshold and high saturation intensity can be achieved as a steady system output through one single frequency pump.