In the trading system, the main board market has some differences with the SME sector. Therefore, there are certain differences in investment. Investors need to understand and pay attention to these investment points, paying particular attention to the difference in the set auction.

1. At present, the main board market only has one set bidding every day. The SME board has two sets of bids every day, and the second time is the closing set bid, which is from 14:57 to 15:00.

2. Between 9:20 and 9:25 am, the Shenzhen Stock Exchange host does not accept the cancellation of SME stocks.

3. Since the closing price of SME stocks is generated by the last three minutes of the auction before the closing, some investors who are accustomed to operating in the late stage should pay attention to this period of time.

4. During the opening of the SME stocks, the Shenzhen Stock Exchange host immediately revealed the opening reference price, matching amount and unmatched amount of SME stocks, which increased the transparency of the opening auction. Investors should use the matching amount and the unmatched amount as new analytical indicators to study the actual trading situation behind the opening price and understand the trend of the main fund.

The SME sector should not only disclose the top three stocks with a deviation of ±7% from the main board, but also increase the top three stocks with a daily price shock of 15%, and the daily turnover rate reaches 20%. The first three stocks are required to disclose.

In addition, it is stipulated that the SME stock exchanges are subject to abnormal fluctuations and should be suspended. Significantly different from the main board market, the definition of abnormal fluctuation range has also increased the new conditions for abnormal turnover rate: the daily average turnover rate for three consecutive trading days, and the daily turnover of the first five trading days. The ratio of the rate reached 30 times, and the cumulative turnover rate of the stock for three consecutive trading days reached 20%.

For such stocks with abnormal turnover, investors should resolutely evade; if they are in a profitable state, they must immediately take profits, so as not to be delayed by the exchange's suspension.