Taobao evaluation refers to the process of evaluating the quality, appearance, color and service attitude of goods after purchase. On Taobao, reverse trading refers to the operation of traders in the same trading day, which is exactly the same as the futures contracts originally bought or sold in terms of variety, quantity and delivery date, but in the opposite direction. Confirmation of receipt means that after the buyer receives the goods, he confirms that he has received the goods in Taobao system and expresses satisfaction, which marks the end of the transaction.