Changes in contract positions can reveal market trading behavior and sentiment. When buyers and sellers open new positions at the same time, the position increases, indicating that the market is more active, which may indicate that bullish or bearish sentiment is increasing; when buyers and sellers close their positions at the same time, the position decreases, indicating that the market is less active, which may indicate that the market is entering a period of volatility or trend exhaustion; and when one party opens a new position and the other party closes its position, the position remains unchanged, indicating that the market has reached a balance between long and short forces.

Contract open interest is an important tool for analyzing market sentiment, liquidity and speculative behavior. Higher open interest usually indicates a more active market with stronger liquidity, while lower open interest may mean less trading or more wait-and-see sentiment in the market. By observing changes in open interest, investors can better judge market trends, capital flows and potential price fluctuations, thereby optimizing trading decisions.