论从整个供应链的角度管理库存（On the management of inventory from the perspective of the whole supply chain）On the management of inventory from the perspective of the whole supply chainAbstract: on the basis of discussing the traditional inventory management mode and its existing problems, the supply is put forwardThis paper introduces two supply chain inventory management models and their advantages.Keywords: inventory management; vendor managed inventory; joint inventory managementInventory enterprises play a very important role in the process of operation. Inventory can improve customer serviceLevel, it allows the product or service to maintain a certain rate of availability, when the inventory position close to the customer, you canMeet higher customer service requirements. The existence of inventory not only ensures the smooth progress of sales activities, but alsoIncreased actual sales. Inventory can also indirectly reduce the operating costs of enterprises, mainly reflected in inventoryIt can make the production larger, less batch, higher level of operation, inventory also helps to reduce procurement andTransportation cost, so as to produce certain economic benefits. However, inventory costs account for a large portion of logistics costsIt includes defects, sluggishness, inventory capital, etc. Excessive inventory leads to the increase of capital and inventory costs,Increasing business risk. Therefore, inventory management research has important economic significance, supply chain inventory managementManagement is an important part of supply chain management, which optimizes the inventory of the whole supply chainHigh efficiency of the whole supply chain.2 traditional inventory management and Bullwhip effectThe traditional inventory management model is mainly based on single enterprise inventory management, is the enterprise of each node aloneEstablish management inventory, from the perspective of maximizing the enterprises own interests, by determining the order point and order quantity to seek dropLow inventory, reduce shortage, reduce the risk of demand uncertainty. The traditional inventory management mode makes the supply chain more efficientThe lack of information communication among enterprises, the degree of cooperation between enterprises is very low. Thus, the Bullwhip effect is produced.The Bullwhip effect is a phenomenon of demand variation amplification in the supply chain, and it is the information flow from the final customerWhen the end is delivered to the original supplier, it can not effectively realize the sharing of information, making the information distorted and graduallyAmplification leads to the increasing fluctuation of demand information. Specifically, retailers are able to copeThe increase of customer demand is often put on the forecast quantity of historical and realistic salesAfter the big order to wholesalers, wholesalers and for the same consideration, increase the amount of orders. So, thoughHowever, the fluctuation of customer demand is not large, but the actual demand is enlarged step by step by adding orders at different levels. For example,If a retailers sales forecast for a product is 10000, in order to cope with the uncertainty of demand, heWill maintain a certain amount of inventory, so he will increase orders on this basis, orders for quantitative change(1+X%) 10000; similarly, his previous wholesalers will increase their orders on the basis of their orders,Therefore, the quantity of order to the manufacturer becomes (1+X%+Y%) 10000Goods must be produced according to the quantity of the orderBullwhip effect.This distortion of information leads to a great waste of inventory in the supply chain and reduces the operation of the supply chainEfficiency can lead to huge economic losses.3 Vendor Managed Inventory (VMI)Vendor managed inventory is based on supplier centric and minimum costUnder the framework agreement, the inventory decision-making rights of the downstream enterprises are given to the upstream suppliers, and the inventory is exercised by the suppliersThe right to make decisions and to continually improve the framework by constantly monitoring and modifying the framework agreement. supplyDistributors collect distribution centers, warehouses and POS data to realize the combination of demand and supply, downstream enterprises only needHelp suppliers make plans, so that the downstream enterprises achieve zero inventory, supplier inventory has also been greatly reduced.VMI is a good supply chain management strategy, which can break through the traditional compartmentalized management modelWith the systematic and integrated management idea, the inventory management is realized, and the supply chain system can be synchronizedOperation.VMI can eliminate the Bullwhip effect to a certain extent. VMI require