Abstract: Objective: To evaluate the airflow organization and distribution conditions in the airconditioning ventilation air ducts and space of a metro train passenger compartment, it is necessary to adopt simulation analysis method for analyzing and assessing the spatial flow field and temperature field in passenger compartment during train air duct design phase. Method: The StarCCM+software is employed to establish a 3D geometric model that includes the supply air duct, return air duct, flow control structures, interior components of the duct structure, the wiring harnesses, drainage pipes, door mechanisms, electrical enclosures inside ducts, and compartment interior elements such as seats, doors and windows. The simulation utilizes a polyhedral mesh to discretize the computational domain and conducts comprehensive simulation analysis of spatial streamlines, velocity fields, pressure fields, and temperature fields for the typical crosssections of ducts and compartment. Result & Conclusion: The supply air duct provides uniform air distribution and performs well in guiding and allocating airflow. The presence of components such as door mechanisms and electrical enclosures in the return air duct reduces the effective area, resulting in increased local airflow velocity. The spatial airflow organization and distribution in compartment are uniform. The compartment interior maintains a slight positive pressure, and the temperature distribution is uniform. The overall technical solution of the airconditioning and ventilation system meets the engineering design requirements.