The Relative Strength Index (RSI) is a technical curve produced based on the ratio of the number of rising points and the sum of the number of rising and falling points within a certain period. It can reflect the prosperity of the market in a certain period of time. It was first used in futures trading by Welles Wilder. Later, people found that among many chart technical analyses, the theory and practice of the strength indicator were extremely suitable for short-term investment in the stock market, so it was used in stocks. Measurement and analysis of rises and falls. This analysis indicator is designed to reflect the strength of price trends with three lines. This graph can provide investors with operational basis and is very suitable for short-term spread operations.