1.a products contribute the most to the company's sales. The head office and all stores should stock up, and the stock-up cycle is the shortest, which can be 1 time a week. In order to reduce the occupation of inventory funds, Class A products should be stored on demand in small batches and batches under the premise of ensuring inventory safety, so as to reduce the total inventory as much as possible and reduce the storage management cost. However, if the inventory control is not good, it is easy to have the risk of out of stock.

2. the sales volume of class b products is second, and the stock of the head office. For stores, as long as they are stocked in central stores in various regions. The lead time can be once a month.

3. Class C is a long-tailed commodity. Just keep a small amount of inventory in the head office. It can be stocked once a quarter, and it is best to concentrate on purchasing, appropriately increase the inventory, and correspondingly reduce the order quantity. In practical work, "double pile method" or "red line method" can be used for rough control.