The trend of futures prices is unpredictable, and people are often confused. The reason is that the change of futures price comes from the competition between long and short sides, and the price has risen and fallen. Obviously, at a certain moment, bulls or bears have an absolute overwhelming advantage. In futures trading that can cause daily limit or daily limit, futures trading pays attention to homeopathic operation, and the daily limit is mainly long. Going empty at this time is obviously a contrarian operation and does not conform to the principle of homeopathic trading. Of course, the daily limit is empty, sometimes. Because Shanghai copper has the influence of outer disk copper, it is necessary to observe and analyze the factors of outer disk more.