Option is a financial instrument based on futures. In essence, the option is to price power and obligation separately in the financial field, so that the transferee of power can exercise power on whether to trade or not within a specified time, and the obligor must perform it. In option trading, the party who buys the option is called the buyer, while the party who sells the contract is called the seller. The buyer is the transferee of power, and the seller is the obligor who must perform the buyer's exercise of power. Specific pricing issues are comprehensively discussed in financial engineering. [ 1]