The key to understanding stock index futures trading lies in its margin mechanism. Unlike the full purchase, the purchase of first-hand stock index futures only needs about 13% of the contract value as a deposit. The minimum requirement for opening an account is 5, yuan. The value of each point in stock index futures is 3 yuan. Taking the current point of 3289 as an example, the first-hand contract value is calculated as 3289 times 3, which is equal to 98, yuan. Therefore, the margin required for buying and selling the first hand is 98, yuan multiplied by 13%. After conversion, the transaction cost of the first hand is about 128,3 yuan. If you are short, you will lose 3 yuan for every drop.

short position is another concept that needs attention. A deposit of 13% means that you can buy the subject matter worth 1 yuan only by paying 13 yuan, and the profit or loss will be yours. If the price rises to 16 yuan, your 13 yuan will become 19 yuan with a net profit of 46%, namely 6 yuan /13 yuan. However, if the price falls to 94 yuan, you will lose 5%. Once the decline exceeds that of 13 yuan, your initial 13 yuan principal will be exhausted, that is, a short position will occur. Therefore, the risks and benefits of margin trading coexist, and investors need to be cautious.