1. The reason for the burr on the one-minute K-line of futures: it may be a knock order or a large order. 1 min seems to be rising steadily, maybe it's just an empty order or stop loss analyzed by others, and then others make an empty order. This list can't be absorbed instantly in 1 minute, because the market transaction volume is limited, so the price falls, and then it is bought and sold, resulting in burrs.

2. "burr" is also called "noise" in futures. It is a small callback trend that appears on the futures market chart in the opposite direction to the original big trend, and it is often difficult to judge whether it is turning (often cheating).

3. Futures and spot are completely different. Spot is actually a tradable commodity. Futures are mainly not commodities, but standardized tradable contracts with some bulk products such as cotton, soybeans and oil and financial assets such as stocks and bonds as the targets. Therefore, the subject matter can be commodities (such as gold, crude oil and agricultural products) or financial instruments.