Short selling is an investment term such as stock futures: for example, when you expect a stock to fall in the future, sell the stock you own when the current price is high, and then buy it when the stock price falls to a certain extent, so the difference is your profit. The influence of shorting may follow the example of foreigners and specify some stocks that can be shorted. For small and medium-sized investors, the introduction of short-selling mechanisms such as stock index futures under current conditions can only mean an increase in risk. Short selling mechanism is a game of the strong. As a vulnerable group in the stock market, it is extremely vulnerable for small and medium-sized investors to participate in this dangerous game without the protection of laws and systems. At present, discussions about the introduction of short-selling mechanisms such as stock index futures are all over the media. In these discussions, everyone pointed out with one voice the necessity, urgency and benefits to the market, but no one mentioned its negative effects. This is the consistent practice of our media. Well said, everyone praises it, but no negative opinions are heard. After the accident, there was a voice of accusation and shirking responsibility. In fact, this is a very irresponsible practice. Short selling mechanism has positive significance and function to the stock market, but its negative influence can not be ignored. Especially for an emerging market with a short history, imperfect legal system, loopholes in rules and extremely asymmetric information, if its negative impact is not paid enough attention and effectively controlled, its lethality will be enough to destroy the whole market, trigger financial turmoil, undermine the stability of the situation and hinder the healthy development of China stock market. This is by no means alarmist. The history of overseas securities market development has repeatedly shown the huge negative effects of short selling mechanism. Of course, we point out that the negative effects of short-selling mechanisms such as stock index futures are not to prevent them from being launched, but only to remind small and medium-sized investors that launching short-selling mechanisms under current conditions means and can only mean increased risks for small and medium-sized investors. Short selling mechanism is a game of the strong. As a vulnerable group in the stock market, small and medium-sized investors will easily participate in this dangerous game if they are not protected by strict and deterrent laws and systems. Because the short-selling mechanism is very risky for the bookmakers, but the temptation of profiteering is huge. Under the temptation of profiteering and poor supervision, they will do whatever it takes to spread more false information, do business more frequently, jointly manipulate prices and so on. Especially under the short-selling mechanism, stock indexes and stock prices will plummet frequently, which will make some groups and individuals gain huge profits and there will be real short positions in the market. For small and medium-sized investors who can only rely on the stock price increase, how can they have the ability to fight with short positions and win? I believe that for the majority of small and medium-sized investors, there must be a vigilance and vigilance against the short-selling mechanism; As far as the regulatory authorities are concerned, we strongly appeal that we must be cautious when launching the short-selling mechanism, especially when introducing relevant laws and regulations, strengthening supervision and effectively protecting the legitimate rights and interests of small and medium-sized investors. Short selling refers to selling stocks at the current price in the expectation of future market decline, and buying them after the market decline to make a profit. It is characterized by the trading behavior of selling first and then buying. Short selling is an important operation mode in stock and futures markets. This is the opposite of doing more. Theoretically, it is to borrow goods to sell first and then buy them back. Generally, the regular short-selling market has a neutral warehouse to provide a platform for borrowing goods. In fact, it is a bit like the credit transaction model in business. 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. Short selling, such as short selling, is simply: no goods are sold first and then bought.