With the rapid development of new energy vehicle industry, as the core power component, the assembly quality of the driving motor directly affects the endurance and service life of the vehicle. In the current mainstream production process, the precision control problems such as stator core pressing deformation and rotor magnetizing offset have become the key bottlenecks that restrict the energy efficiency and reliability of the motor. This paper systematically discusses the core pain points of the assembly process of the drive motor, aiming to build an assembly paradigm covering the whole process of manufacturing and testing. It provides process guarantee for the efficient and long-life operation of the electric drive system of new energy vehicles.