Abstract: In recent years, due to national policy and local support, the new energy vehicle industry has developed rapidly, and pure electric buses have become more and more popular in the market, and the frequency of appearance in real life has also increased. To ensure vehicle performance and personnel safety, on-site installation and debugging is particularly critical, which requires relevant practitioners to have a certain knowledge base and practical hands-on ability to check the installation and collect CAN messages using the vehicle to troubleshoot potential problems and ensure that the vehicle is stable in operation. This paper discusses and analyzes the five aspects of low-voltage power testing, communication testing, high-voltage testing, dynamic testing, and NVH testing based on the experience of working in debugging vehicles, and analyzes and discusses the problems that exist in the debugging process of pure electric buses to ensure that pure electric vehicles can operate safely, reliably and comfortably.