According to the contract, Shanghai Aluminum Futures Exchange charges no more than two ten thousandths of the transaction amount (including risk reserve), and the minimum margin ratio is 5% of the contract value. For example, the first-hand Shanghai aluminum futures are 5 tons. According to Shanghai aluminum 1408, the current price is 13940 yuan per ton, so the value of the first-hand Shanghai aluminum futures contract is 13940*5=69700 yuan. So the minimum deposit is 69700 * 5% = 3485 yuan. Of course, the futures company will add a part of the deposit. If the margin is 5%, then the leverage is 100/5=20 times. Of course, futures companies don't have that high leverage, which is generally around 10 times.