Binary options, also known as digital option and fixed income option, is one of the simplest and most popular financial transactions. There are only two possible outcomes when binary options expires. According to whether the closing price of the underlying assets is lower or higher than the strike price within a specific time (such as the next hour, day, week, etc.), whether to make a profit or not is determined. ). If the trend of the underlying assets meets the pre-determined starting conditions, binary options traders will gain a fixed amount of income, otherwise they will lose a fixed amount of investment, that is, fixed income and risk.