The negative pressure on the surface of high-speed train reduces cooling air volume successively.The average negative pressure value and cooling air volume were obtained by numerical simulations at different speeds.The results show that the negative pressure in high-speed conditions impacts the running of condenser fan.Larger condenser fan was chosen,frequency conversion technique was used,and a PID control method taking condensation temperature as feedback signal was established.The power consumption was compared between variable frequency operation and constant frequency operation at different speeds.It is concluded that the frequency conversion condenser fan has good energy saving effect and load adaptability at low speed.The conclusions provide technical basis for the application of frequency conversion condenser fan to high-speed train.