Combing the current situation of the auto gearbox and approaching the Quality Matrix and the Batch List Theory，the gearbox assembly line quality problems were analyzed. Based on the above two theoretical design quality retrospective program，applying the IDEF method for modeling，the major quality problems and the main parts of the comprehensive engineering were assessed with the integrated application of the Excel powerful data processing tools and Pareto charts. And then it uses Batch list to identify the batch of parts information，so as to achieve the purpose of identifying the root cause of quality problems，which is the purpose of the quality traceability. By improving the quality of the source，it can continue to reduce the number of problem parts. Take the deformation and fracture of gearbox spindle for example，trace the quality problems of gearbox，it demonstrates that this project improve the gearbox’s quality and provide basis for improving the quality of programs.