There are four kinds of wheat futures contracts, the inner disk includes ordinary wheat, strong wheat and hard wheat futures contracts, and the outer disk includes CBOT wheat futures contracts. _ Pumai Futures Contract The trading code of ordinary wheat is PM, which is listed on Zhengzhou Commodity Exchange. The trading unit is 50 tons/lot, the minimum price change is 1 yuan/ton, and the minimum trading margin is 5% of the contract value. _ Strong Gluten Wheat Futures Contract The trading code of high-quality strong gluten wheat is WH, which is listed on Zhengzhou Commodity Exchange. The trading unit is 20 tons/lot, the minimum change price is 1 yuan/ton, and the minimum trading margin is 5% of the contract value. _ Hard Wheat Futures Contract The trading code of hard winter white wheat is WT, which is listed on Zhengzhou Commodity Exchange. The trading unit is 10 ton/lot, the minimum price change is 1 yuan/ton, and the minimum trading margin is 5% of the contract value. _ CBOT wheat futures contract CBOT wheat trading code is W, the contract unit is 15000 bushels, and the quotation unit is cents or 1/4 cents per bushel.