Body welding is one of the most important process in the white body manufacturing process. The quality, accuracy and production efficiency of body welding have a direct impact on the quality, accuracy and production efficiency of the vehicle. The mixed flow flexibility technology of the welding production line is used in multiple types of vehicle models and flexible manufacturing, saving customers a lot of equipment investment required for model renewal. When planning the production line, Shuangjun Technology comprehensively considers the product characteristics, rhythm requirements, project budget, factory restrictions, quality goals, logistics needs and safety, etc., to achieve the best balance between flexibility and economicality of the welding production line, so that the production line can achieve the best cost-effectiveness.