Point B in the K-line represents buying, and point S represents selling. After logging into the securities trading account, if there is a buy in the trading account on that day, there will be a B point on the K line, and there will be an S point on the K line when there is a sell operation. In addition to point B and point S, there is also point T. There is a sale that day, and point T will be displayed on the K-line. Investors can know their own trading situation through point B and point S.

K-line chart, which originated in Japan, was used by Japanese rice market businessmen to record the rice market and price fluctuation at that time, and was later introduced into the stock market and futures market because of its ingenious and unique drawing method. This chart analysis method is particularly popular in China and even the whole Southeast Asia. Because the chart drawn in this way looks like candles, and these candles are black and white, it is also called yin-yang line chart.

Through the K-line chart, we can completely record the daily or periodic market performance. After a period of trading, the stock price forms a special region or form on the chart, and different forms show different meanings. We can find some regular things from these morphological changes. The forms of K-line chart can be divided into reverse form, arrangement form, gap and trend line.