I have a different calculation and analysis result from others on this issue: 1, and the deposit used when opening positions: 4000 * 40 * 300 * 0.15 = 7200000; 2. Loss of the day: (4000-3680) * 40 * 300 = 3840000; 3. The deposit actually occupied on the day after closing: 3680 * 40 * 300 * 0.15 = 6624000; 4. Notify additional margin; 5. The balance of settlement reserve on the day after closing =100000 -6624000-3840000 =-464000 (that is, the balance of settlement reserve on the day is insufficient and should be replenished), so the settlement amount should be 3680 * 300 =1104000; Actual situation of the account on the day after liquidation: transaction margin occupation = 3680 * 39 * 300 * 0.15 = 6458400; Balance of settlement reserve =110.4-46.4 = 640,000.