1, futures technology contains many contents, such as Dow theory, trading volume, interest in holding positions, etc.

2. Three trends of Dow Theory, namely, short-term, medium-term and long-term trends, short-term or long-term markets, major short-term markets and major long-term markets;

3. Volume is a tool to reflect the mentality of market investors. Investors who are optimistic about the current trend will naturally increase the trading frequency;

4. Until the market closes on a certain day, the total number of all open contracts is the interest of the positions held on that day, which shows the views of most investors on the whole market.