K-line (candlestick chart), also known as "Yin-Yang candle", is a chart reflecting the price trend. It is characterized by recording a lot of information in a line segment, which is quite easy to read and understand, practical and effective. Widely used in technical analysis of stock, futures, precious metals and other markets, it is called K-line analysis.

K-line, also known as candle chart, daily line, yin-yang line, bar line, etc. At present, it is commonly used as the "K-line", which originated from the rice market transactions in Japan18th century Tokugawa Shogunate (1603 ~ 1867) and is used to calculate the daily rise and fall of rice prices. Because of its unique drawing method, it is introduced into the analysis of stock market price trend. After more than 300 years of development, it has been widely used in stock, futures, foreign exchange, options and other trading markets.