1, using the long and short index, the full name of the long and short index in English is "Bull and Bear Index", which is a comprehensive index after the weighted average of different moving averages and belongs to the moving average index. When using EMA, investors often have different preferences for the choice of parameter values, and long and short indicators just solve the rationality problem of short-term EMA. Since the long-short indicator is developed on the basis of the moving average, glanville's law can also be referred to in the application, as follows: 1) In the high-priced area, the closing price falls below the long-short line as the selling signal. 2) In the low-priced area, the closing price breaks through the long-short line as a buying signal. 3) The long and short indicators increase from bottom to top, and the stock price is above the long and short line, indicating that the bulls are strong and can continue to hold shares. 4) The long and short indicators decrease from top to bottom, and the stock price is below the long and short line, indicating that bears are strong and generally not suitable for buying. 2. The method of judging the characteristics of long and short market in direct technical analysis should be used from a higher angle, rather than providing a basis for daily operation. The driving force of long and short market is how to combine the characteristics of long and short market with eight trading methods, and add the volume factor to make a more practical analysis of the nature of the market.