There are two contracts for CBOT soybeans, and the big contract is 5000 bushels (136. 08 tons), the opening bond is more than 7000 yuan, the maintenance bond is more than 5000 yuan, the small contract 1 000 bushels (27 tons), the opening bond and the maintenance bond 1 000 yuan. (deposits are the same as domestic deposits, but the difference is that deposits are fixed, so the leverage is changing, just like domestic mechanical leverage.