In Tongda letter futures, the main chart index formula of long and short is as follows: 1. The main chart indicator formulas for long and short positions are Ma (closing, 5) \ u003EMa (closing, 10) and MA (closing, 10) \ u003EMA (closing, 20) and MA (moving average). U003 EMA (closing, 60) and U003 EMA (closing, 5) 2. Exponential formulas for shorting the Main chart: ma (closing, 5) \ u003cma (closing, 10) and ma (closing, 10) \ u003cma (closing, 20) \ u003cma (closing, 60) and closing \ u003. By comparing the positions of different moving averages and the relationship between prices and moving averages, we can judge the market trend and price trend. At the same time, we can also make specific trading decisions based on these data.