When MACD and trigger line are positive, that is, above the 0 axis, it means that the megatrend is still in the bull market and the trend line is upward. At this time, the columnar vertical line extends from the 0 axis, and you can buy boldly. When MACD and trigger line are both negative, that is, below the 0-axis, it shows that the megatrend is still in the short market and the trend line is downward. At this time, the columnar vertical patterns start from the axis 0 and are below the central axis 0, and they extend below the axis 0. It should be sold at once at this time. When MACD deviates from the trend of K-line chart, it should be regarded as a signal that the stock price is about to reverse, and we must pay attention to the intraday trend. As far as its advantages are concerned, MACD can automatically define whether the current stock price trend is long or short, thus avoiding the danger of reverse operation. After determining the trend, an access policy can be established to avoid unnecessary access times or inappropriate access timing. Although MACD is suitable for judging the medium-term trend, it is not suitable for short-term operation. Furthermore, MACD can be used to judge the beginning and end of the mid-term rising or falling market, but it is of no value to the box-shaped large oscillation trend or the disk sticking. In the same way, when analyzing the trend of each stock with MACD, it is more suitable for investment stocks that have plummeted, but not for so-called cowhide stocks with little price change. In short, the function of MACD is to find out the overbought selling point of the market from the inflection point of the market.