The contents of the book are closely related to the practical application, using the CRH1, CRH2, CRH3 and CRH5 air conditioning systems in China as case studies. The book mainly covers: EMU environment and its control system, EMU basic environmental control principle, ventilation system, refrigeration system, heating and humidification system, EMU air conditioning system operation control, typical EMU interior environmental control system, EMU air conditioning system failure analysis and maintenance.