Abstract: The heat can be effectively dissipated and the harmful humid gas and dust can be isolated using a thermosyphon spreader in a general sealed electric cabin.The heat radiation performance of the thermosyphon spreader is experimentally investigated under different heat fluxes (800-1 200 W) and different environmental temperatures (39-53 ℃).Experimental results show that the heat radiation performance of the thermosyphon spreader is good,and there is no other power consumption except for fans.When the temperature difference between the inside and outside of the cabin is less than 20 ℃,the air temperature in the cabin is not more than 65 ℃ for different heat fluxes and environmental temperatures using the thermosyphon spreader.The temperature difference between the inside and outside of the sealed cabin is kept in the range of 11-17 ℃,which shows that the thermosyphon spreader is suitable for the situations with about 15 ℃ temperature difference between the inside and outside air.In addition,the thermosyphon spreader has high reliability,the energy efficiency ratio (EER) of the thermosyphon spreader is 2-3 times as much as that of the conventional air-conditioner,and the cost is 1/3~1/2 as much as that of the conventional air-conditioner.