There is a difference between the main contract and the index contract:

The index is the index of the commodity calculated by weighting the trading volume of each contract. It is generally recorded as an index in the commodity. , while in CFFEX, it is directly recorded as a weighted contract, such as IF weighting.

The main contract is the continuation of the main contract, that is to say, the main contract is the mechanical connection of all the main contracts, forming a continuous contract of the contract with the largest daily trading volume and open interest, which will form A relatively continuous K-line chart. That is the main contract.

The main contract is the connection of the main contracts in different periods. The index is formed by weighting all contracts according to the trading volume. Obviously, it is easy to see that the main contract will have gaps due to the situation of moving positions to different months, so the main contract will be incomplete; and the index is the weighting of all contracts, so it will have excellent continuity.

And it is not mainly goods, but a standardized and tradable contract based on a certain bulk commodity such as cotton, soybeans, oil, etc. and financial assets such as stocks, etc. Therefore, the subject matter can be a certain commodity (such as gold, crude oil, agricultural products), or a financial product (such as CSI 3 (IF), SSE 5 (IH), CSI 5 (IC)). Tianjin Founder Medium-Term Binhai Sales Department can not only open commodity accounts (including crude oil accounts), but also financial accounts (such as stock index accounts).