Winning lots: because the funds for buying new shares are far more than the shares issued. So assign a number to each stock unit. Then shake the number. You can win the lottery and get stocks with a shake. If you don't shake it, you can't buy stocks, and the funds will be returned after T+4 days.
According to the rules of the exchange, the winning rate will be announced, and the lead underwriter will preside over the lottery to confirm the winning result according to the total allocation number, and the winning result will be announced in the designated media on the first trading day (T+4 days) after the lottery. In China, each winning number can subscribe for 1000 shares (Shanghai Stock Exchange) or 500 shares (Shenzhen Stock Exchange).