Open position in futures refers to the sum of positions bought (or sold) before open position, which generally refers to the sum of contracts with different buying and selling directions, so it is generally even. By analyzing the change of opening positions, we can analyze the size, change and renewal of long and short forces in the market, thus becoming one of the technical analysis indexes different from stock investment.

1. The trading volume is gradually increasing, while the positions are gradually decreasing.

This situation generally occurs in the process of a market relay, and is accompanied by the phenomenon of killing more and more. Because the market is beneficial to one of the long and short sides, the other side has fled and their positions have gradually decreased. However, the rapid price movement provided a good opportunity for short-term speculation, so short-term funds actively intervened and the transaction did not decrease. Sometimes the increase of short-term positions masks the withdrawal of long-term funds, which leads to the trend of decreasing positions is not obvious. In this case, it may be accompanied by a mid-term rebound. Because of the violent rebound, it often gives people a feeling of turning around, but the original trend will continue.

2. The trading volume is gradually decreasing, and the positions are gradually decreasing.

This situation mostly occurs at the end of a wave of market, and the synchronous contraction of trading volume and positions proves that both long and short parties or one of them lose confidence in the market outlook and the funds are gradually withdrawing. If this situation continues to develop, it will provide favorable conditions for the intervention of new funds and become a precursor to change. As the volume of transactions and positions are relatively small, the market is easily influenced by external factors, and the price fluctuation is random, which will cause unnecessary losses to investors.