The currency-based multi-currency rotation strategy is suitable for customers who hold a certain currency for a long time (such as ETH, which can achieve lossless arbitrage by trading the premium of the locked-up token BETH). The strategy constructs a series of buying and selling prices through a certain price range in a volatile market or a large-scale range, and automatically executes buying low and selling high, so as to obtain band income within the range. Specifically, based on a certain price, in a certain interval, a certain number of buy and sell orders are placed at the upper and lower prices in a proportional or arithmetic manner, and sell high and buy low. Through the continuous fluctuation of digital asset prices, it will automatically buy low and sell high, and continue to make profits on the basis of coin-margined.