1. Calculate the net inflow of main funds in the day, and the net inflow of main funds is equal to the transaction amount.

2. Calculate the trend index of main funds. The activity of main capital refers to the understanding and confidence of main capital in the market. The trend index of main funds can show investors the attitude and trading ideas of main funds. The trend index of main capital is equal to the sum of the net inflow of main capital on the 5th and the cumulative turnover on the 5th.

3. Calculate the increase or decrease of the main contract. The fluctuation range of main contracts is an index derived from the trading in the futures market, which reflects the trading vitality and relative strength of mainstream contracts. The rise and fall of the main contract is equal to the positions of the main contract today and yesterday.