The contract ratio is the ratio of the number of people or accounts. The value of multiple orders and empty orders of futures contracts is always equal to 1: 1. If the long-short ratio of the contract is 1.5, it means that there are more people with more orders than empty orders. The positions used are of equal value, so there is a lot of data in the big empty house. The so-called big house is a person with strong financial strength. Their attitude may reflect the trend of the market. Of course, this cannot be absolute, and it can only be used as a reference for billing operations.