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大型高海拔空气簇射观测站（ LHAASO ）的所有探测器都将在羊八井进行宇宙线探测工作，其工作环境为高海拔（海拔4300 m）、低气压（大气压强0．6 atm）、昼夜温差大（温度-25～40℃）。即便如此，探测器依然要求稳定运行，为了保证光电倍增管的增益变化在5％以内，高压电源模块的温度系数和纹波系数要分别小于0．01％/℃和0．01％。为此，搭建了模拟试验系统，其试验箱中的温度和气压均可控。不同厂家不同型号的电源模块在模拟试验箱中进行了测试，试验结果表明，3个厂家的电源模块均满足要求。“,”The Large High Altitude Air Shower Observatory ( LHAASO) detectors would be operated at Yangba-jing, under the condition of high altitude (4300m, 0.6atm) and large dynamic temperature variation (from -25°C to 40°C).To keep the gains of the photomultiplier tubes used stable within 5%, it is required that the temperature coefficient and ripple index of the power supplies should be less than 0.01%/C and 0.01%, re-spectively .Different types of power supplies were tested in an environment simulation system , where the tem-perature and air pressure are controllable , three of which meet the requirements and are chosen as the candi-dates .