K-line chart is a common chart form in stock analysis, and point B and point S are two important signals. Point B means that after the stock price falls to a certain extent, there is a buying signal, which usually means that the stock price shows signs of bottom reversal, and investors can consider buying the stock. S point refers to the selling signal after the stock price rises to a certain extent, which usually means that the stock price shows signs of top reversal, and investors can consider selling the stock. These signals can be judged by technical analysis methods, such as moving average, relative strength index and so on.

Point B and point S are important signals in stock analysis, but they are not absolutely accurate forecasting tools. Investors need to combine other factors to make comprehensive analysis and judgment.