Abstract: In order to study the distribution and variation rule of the surface temperature of vacuum tube maglev train with the change of train speed and vacuum degree, this paper studies the temperature distribution on the surface of the train, the equipment cabin, and the suspend and guide electro-magnet under the condition that EMS(electric-magnetic suspension) maglev train is running at high speed in the vacuum tube by the computational fluid dynamics(CFD) analysis method.A simplified three-dimensional model of a vacuum tube maglev train with heat sources such as equipment cabin, suspend and guide electro-magnet, and long stator track is established.The effects of train speed and vacuum degree on heat dissipation capability of the heat emitting equipment are studied when the blockage ratio is 0.2 in the vacuum environment.The numerical results indicate that the temperature of the heat emitting equipment increases gradually along the body, reaches the maximum in the middle section of the train, and then decreases gradually in the streamline area of the tail car; when the vacuum degree is 0.01 atm and the train speed is 800 km/h, the super-hot point occurs on suspend and guide electro-magnet, and the maximum surface temperature is 454 K.The results can provide a theoretical basis for the design of the vacuum tube maglev system.