Short-selling means: Short-selling is a common operation method in the stock futures market. It is expected that the stock futures market will have a downward trend. The operator will sell his chips at the market price and then buy them after the stock futures fall to earn the middle price difference. Shorting is the opposite of doing long. Theoretically, it is to borrow goods to sell first and then buy them back. Generally, the regular short-selling market has a platform for third-party brokers to borrow goods. Generally speaking, it is similar to a credit transaction. This model can profit in the wave band of falling prices, that is, borrowing goods at a high level and selling them, and then buying and returning them after falling. So buying is still low, selling is still high, but the operating procedures are reversed.