At present, only the SSE 50ETF option is listed in China, and the commodity options contract of sugar and soybean meal will be listed soon. Buying and selling options is similar to buying and selling futures contracts. The difference is that the option has power but no obligation to the buyer, and the seller has only obligation but no power. If the buyer wants to buy or sell the subject matter within the validity period of the contract, the seller must accept it. In addition, the buyer does not have to pay a deposit, and the seller must pay a deposit.