Production line refers to the workers in accordance with a certain production process, the order of production through various work centers, and in accordance with a certain production speed (beats) to complete the operation of a series of continuous production of a production organization. The purely one-way, continuous efficiency, specialization, balance and dominance of the assembly line determine the need for logistics operations in the factory to be subordinate to and serve the needs of the production process. The core is intertwined in the production process, so In-plant logistics is highly cooperative, dynamic, distributed and balanced. At the same time, this characteristic changes with the change of production environment, conditions, markets, product models and processing technologies, and the optimization and balance are resumed.