The price list is one of the important data in the secondary market. During the trading period from opening to closing, there will be the highest price and the lowest price, and the trading of the day is mainly completed within this price range. But it is possible that the trading volume at a certain price is large, while the trading volume at a certain price is relatively small. Even at the same price, the trading volume is either actively bought or actively sold. According to the published secondary data, the price list function of Huabao Zhitou secondary market accurately counts the volume of each price within the transaction price range.