VaR method can let futures traders know clearly whether the risk in the current market is too large, and let futures traders judge whether the time is right or not and whether it is suitable for spot contract trading before doing futures trading. If the VaR value is relatively large, it means that the opportunity cost of entering the market at this time will be relatively large; On the other hand, if the VaR value is relatively small, it means that the opportunity cost of entering the site at this time will be smaller. For futures traders who already own future positions, VaR can show whether the risks they have taken have exceeded the tolerable limit.