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　　Just in time production is the key.

　　5S management is the basis of enterprise management, in the face of changing market demand, enterprises should implement how to reduce waste management tools, improve efficiency, so that all production value added and the corresponding return it? Lean production "just in time production" (JIT production) is the key to solve this problem.

　　"Just in time production" (JIT) is one of the pillars of lean production. It is the ultimate goal of lean production. Its basic idea is "to produce the required product according to the required quantity" only in the time of need ". Through the continuous elimination of waste, reduce inventory, reduce adverse, shorten the manufacturing cycle time and other specific requirements to achieve. It covers the use of lean production in the use of all relevant tools.

　　In order to ensure the just in time production, eliminate waste, first of all to understand at present and in the future, the whole production activities (raw material input to product delivered to the customer in the process) in the presence of non value added waste phenomenon can be avoided or improved. So it is very necessary to draw and analyze the value flow diagram.

　　Prior to the analysis, we must first clear implementation steps. First need an understanding of the value of the product flow and can promote the improvement of personnel, according to the relevant business experience, the person should have leadership and responsibility, by him to lead a team of value stream mapping analysis work; according to the principle of the 2 / 8. In view of the impact of the largest product graph analysis; figure analysis should be before the improvement, to facilitate in process to determine the improvement which processes; in the field collected information and data and avoid computing systems in the data, the scene only to collect data to truly reflect the true state of the value stream.

　　Value stream chart analysis the main steps of: understanding and record the customer's requirements, understanding and draw out plant material flow, data collect and record each of the production process, to understand the inventory, information transfer and information.

　　The purpose of the current status of the value flow diagram is to put the current production status of the wave cost of drawing and calculation of the way to fully show, to find out the reasons, to take measures to gradually improve. The purpose of the value stream map to analyze the future state diagram is to make the current value flow into the lean value stream.

　　Future value stream design criteria should be according to the customer takt time, as much as possible to achieve continuous flow, set up Kanban management can not be achieved continuous flow; to make customer orders only to a value flow starting process according to the uniform distribution and variety of student produced in the production process to; in the value flow process by initiating a unit of work to achieve the initial pull start; in the value flow start upstream process to form every day to be able to manufacture all parts.

　　In the value stream should pay attention to mapping process, mapping method is found the key value stream and the source of waste, must eliminate waste through lean technology, in order to receive the results; personnel must be trained to master relevant knowledge, to avoid the wrong direction; the choice of products should be paid attention to in consideration of production at the same time take into account the product value, profit and its impact on corporate survival and development; must as far as possible to complete the current map data in a relatively short period of time the collection value of the status quo of drawing; customer demand should be modified according to the actual delivery time history, customer pull and finished goods warehouse delivery pull two ways are actually pulling by the customer demand, the key difference is whether the establishment of finished goods inventory.