According to the contract, the subject matter and the place of delivery, the contract number. 1 1 is different from the contract number 14. Sugar 1 1 index refers to the continuous compilation of indexes with the positions of sugar 1 1 as the weight and the contract prices as the weighted average. The same is true for other commodity indexes. The purpose of continuous index compilation is that a single contract is limited to the time interruption after delivery, so it is impossible to track the price pattern of a certain variety for a long time, so we can only analyze and study the long-term trend with the help of long-term charts.