Assembly process planning automobile production line is the bridge between the design and large-scale production. It is extremely important. Not only it affects directly the assembly efficiency and the quality, moreover has decided the workshop building, the equipment investment, quantity of production personnel, goods in process quantity and so on. Whole optimization and the partial purification of the assembly craft will all have the huge economic efficiency, and obviously strengthen the emulative power of automobile production enterprise in the market. In order to optimize the result of craft planning, enhance the quality and efficiency of computer aided assembly process planning and reach expected output and efficiency, the optimizing of automobile ALB (Assembly Line Balancing) problem is deeply analyzed with linear programming theory. Besides, linear programming mathematical model of ALB problem is established. Based on the mathematical process modeling and the generation of assembly sequence and considered the relative factors between production line and process planning, basing chart of process for assembly line (PAL Chart) a modeling method is put forward. It includes the main parameters of the assembly process planning and displays the planning result directly.