1. Cross-variety arbitrage: refers to the arbitrage of two different commodity futures contracts, which has great substitution. Cross-variety arbitrage usually occurs between raw materials and finished products, and it is a common arbitrage method. 2. Intertemporal arbitrage: refers to the arbitrage method of obtaining the profit difference by using two contracts with different delivery dates for the same commodity. The key to intertemporal arbitrage is that the commodities and trading time of the two contracts must be the same, but the delivery month and contract price must be the same as the trading time, but the delivery month and contract price must be different before arbitrage can be carried out. 3. Cross-market arbitrage: Cross-market arbitrage refers to an arbitrage behavior of trading futures contracts in the same delivery month on two different exchanges, and making use of regional price differences to obtain profits. This arbitrage can be carried out on domestic exchanges or between foreign exchange. This paper focuses on the important factors that affect the market price difference under different conditions. KaoJiaZhao.Com