The main contract of live pig futures refers to the contract with the largest transaction volume, the best liquidity and the most representative price among the live pig futures contracts listed on the exchange. The main contract is the most concerned contract for traders and one of the most active contracts in the market. Traders understand market trends and price changes through the main contract, and conduct trading and risk management. In the hog futures market, the main contract delivery months are 1, March, May, July and September, 1 1, and the trading activity and volume are the highest in these months.