K-line chart is also called Yin-Yang candle chart. A positive candle means that the closing price of this period is higher than the opening price, and a negative candle means that the closing price is lower than the opening price. The top and bottom of the candle reflect the highest and lowest prices in this period. According to the opening price, closing price, highest price and lowest price, the negative line and the positive line will present different forms.

The most important reference index of K-line chart is the moving average system, which is the most important reference index of stock market operation. The arithmetic average is taken from the closing prices of the first nine days and ten days of the day, and then the curve connecting the arithmetic averages of these days is the ten-day moving average. Similarly, there are ten-minute moving averages, ten-hour moving averages, and various moving averages made in different time units such as weeks, months and years. Usually, the average value of 10 time unit is collectively called 10 average value. A 20-fold moving average is a moving average of 20 time units. The above is a common practice. Some people take the average daily price, while others take the average weight. And the practice is different. In the K-line diagram, the constants are MA5, MA 10, ....

Kdj indicator is overbought and oversold indicator.