The main basic indexes of technical analysis of futures prices are opening price, closing price, highest price, lowest price, trading volume and positions. Since the open contract refers to the number of contracts that have not been hedged and settled during the period from the beginning of the transaction to the end of the open contract, the more open contracts, the greater the sum of closed contracts and physical delivery before the contract expires, and the greater the transaction volume. Therefore, the analysis of the change of positions can infer the flow of funds in the futures market. The increase in positions indicates that funds flow into the futures market; On the contrary, it means that funds are flowing out of the futures market.