Abstract: Objective: To effectively address the issues existing in Chengdu Metro vehicle equipment maintenance and improve the reliability of vehicle equipment, Chengdu Metro vehicle discipline needs to gradually carry out research on component independent and deep maintenance for electric passenger cars. Method: Firstly, the main problems existing in Chengdu Metro vehicle equipment are elaborated, and the failure situations of various key subsystems of the vehicle are analyzed. Secondly, the technical and management measures of vehicle discipline for component deep maintenance are discussed, and the organizational structure for vehicle component deep maintenance is established. The main factors to be considered in the construction of deep maintenance sites and facilities are explained, and the comprehensive guarantee mechanism related to it is also elaborated. Finally, based on the implementation overview of vehicle specialized component deep maintenance, the vehicle specialized component deep maintenance implementation effect is analyzed. Result & Conclusion: After component deep maintenance, equipment failure rate decreased evidently, equipment maintenance cost dropped drastically, solving the metro vehicle maintenance problems and improving vehicle independent maintenance capability.