Based on numerical simulations at home and abroad,a more accurate calculation program for solving gain field of mixing gasdynamic CO2 laser (MGDL)was set up.Using this program,small signal gain distribution rule in optical cavity of mixing gasdynamic CO2 laser based on screen nozzle was studied,and the influence of inlet total tem-perature of donor nozzle on small signal gain of mixing gasdynamic CO2 laser based on screen nozzle was studied.Cal-culation results indicate that there is an optimal inlet total temperature of donor nozzle which can maximize the small signal gain in optical cavity while the other parameters keep unchanged.While the inlet total temperature of donor nozzle is lower than this optimal value,small signal gain in the same position of optical cavity becomes higher when in-let total temperature of donor nozzle becomes higher.While the inlet total temperature of donor nozzle is higher than this optimal value,small signal gain in the same position of optical cavity becomes lower when inlet total temperature of donor nozzle becomes higher.Furthermore,influence mechanisms of inlet total temperature of donor nozzle on small signal gain are analyzed.%在国内外数值模拟工作的基础上，建立了更加准确的“混合型气动 CO2激光器（简称MGDL）”增益场计算程序。利用该程序，一方面研究了基于筛形喷管的混合型气动 CO2激光器光腔中的小信号增益分布规律；另一方面着重研究了主喷管入口总温对基于筛形喷管的混合型气动 CO2激光器小信号增益系数的影响规律。计算结果表明：当其他参数不变时，主喷管入口总温存在一个最佳值，使得光腔中的小信号增益系数最大；当主喷管入口总温小于这个最佳值时，随着主喷管入口总温的增加，光腔中相同位置处的小信号增益系数逐渐增大；当主喷管入口总温大于这个最佳值时，随着主喷管入口总温的增加，光腔中相同位置处的小信号增益系数逐渐减小。此外，分析了主喷管入口总温对小信号增益系数的影响机制。
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