1. futures index: refers to futures contracts with index-based assets, such as stock index futures. The commodity index calculated by weighting the trading volume of each contract is generally recorded as an index in commodities, while it is directly recorded as a weighted contract in CICC, such as IF weighting.

2. Main Contract: the continuity of main contracts, that is, the main contract is the mechanical connection of all main contracts, forming a continuous contract with maximum daily turnover and positions, which will form a relatively continuous K-line chart. Which is the main contract.

Second, the marks are different.

1. futures index: a financial futures contract with the stock price index as the subject matter, that is, a standardized contract with the stock price index of the stock market as the subject matter, which is concluded by both parties to the transaction, agreeing to trade the stock price index at a specific time in the future.

2. Main contact: The main contact contract is the contact of main contracts in different periods, and all contracts are weighted according to the volume to form an index. Obviously, there is a gap in the main contract because of the month change, and the index is the weight of all contracts, so there will be excellent continuity.

Third, the delivery date is different.

1. futures index: the price date is decided by the buyer and the seller. The delivery date can be one week later, one month later, three months later or even one year later.

2. Main company: the delivery date must be completed within three months after the completion of the agreement.