Legal, because Xiaomi Futures has legal procedures and operating methods. Futures are the subject of current transactions, but will be settled or delivered in the future. Xiaomi mobile phone is a thing, the price of Xiaomi mobile phone only exists in the future. The sales price announced now actually exists in the future. In other words, the sales price announced by Xiaomi mobile phone does not exist, and the product does not exist. Futures trading is long-term (three months, six months, one year, etc.). ) trading method. ) Deliver specific goods according to the time, place and quantity in the contract.