The effect of the negotiations should be tracked from six aspects. Firstly, whether the product meets the customer's needs and how satisfied the customer is. Then it comes to track about whether the total amount of goods purchased, the structure of the goods, and the lot size are appropriate. Thirdly, whether the quality of the goods is stable and can meet the customer's needs. Then, whether the supply of goods comes from the source. Fifthly, whether the after-sales service is good and reliable, whether the complaint can make a rapid response, whether the claim is simple and easy. Lastly, whether the delivery is timely, whether the supply quantity is flexible, whether the delivery time is appropriate, whether it can guarantee the normal sales within the time required for purchase, whether the delivery is too early will lead to a backlog of inventory, and whether the delivery is too late will be out of stock. In this way we can master all the information we need and try to make revisions next time.