K line refers to the stock trend in the K line chart, originated in Japan during the Tokugawa Shogunate era (1603 ~ 1867), was used by the Japanese rice market traders at the time to record the market and price fluctuations in the rice market, and then because of its delicate and unique way of marking the drawing and was first introduced into the futures, many people think that the K line is the first from the stock market to begin with. Through K-line charts, we are able to record the daily or a certain period of stock market conditions and performance, the stock price after a period of time after the disk file, that is, the formation of a special area or pattern on the chart, different patterns show different significance. The three K-line combinations of insertion lines, holding lines and favorable stimulus lines are the most common classic bottoming patterns.