K-line chart is an important tool for investors to observe stock price changes, and vol refers to trading volume. Volume is the number of stocks bought and sold, and it is an indicator of market activities. In the K-line chart, vol is displayed in the form of histogram, and the column height shows the volume. Usually, when the stock price rises or falls sharply, the trading volume will be obviously enlarged, which is an important indicator that cannot be ignored when analyzing the stock trend.

The change of K-line vol has a great influence on investors' trading decisions. When the trading volume increases and the price rises, it shows that the market is optimistic about the prospects of the stock, and investors can consider following up and buying; On the contrary, when the trading volume is enlarged but the price falls, it shows that investors in the market have lost confidence in the stock. At this time, you can consider selling stocks to avoid further losses.

As an important technical index, K-line vol is not only used in the stock market, but also in various futures and foreign exchange transactions. Investors need to make good use of the data of K-line vol, analyze the trend of volume and price, understand the changing law of the market and take good risk control measures in order to succeed.