candle charts are also called candle charts, Japanese lines, yin and yang lines, bar lines, red and black lines, etc., which are commonly referred to as "k lines". It is based on the opening price, the highest price, the lowest price and the closing price of each analysis period.

K-line chart [1] is a kind of technical analysis, which was first created by myself in the 19th century, and originated from the rice market trading in the 18th century Tokugawa shogunate era (163-1867) in Japan. It was used to calculate the daily rise and fall of rice prices, and was used by traders in Japanese rice markets at that time to record the market and price fluctuations of rice markets, including the opening price, closing price, the highest price and the lowest price. The sun candle represented the day's rise. This chart analysis method was particularly popular in China at that time and even in 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, people can completely record the daily or a certain period of 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. Some regular things can be found out from these morphological changes. The form of K-line chart can be divided into reverse form, arrangement form, gap and trend line. The post-K-line chart is introduced to the stock market and futures market because of its exquisite and unique plotting method. The drawing method of K-line chart in stock market and futures market contains four data, namely, opening price, highest price, lowest price and closing price. All K-lines are developed around these four data, reflecting the general situation and price information. If you put the daily K-line chart on a piece of paper, you can get the daily K-line chart, and you can also draw the weekly K-line chart and the monthly K-line chart.