Initial public offering (IPO) refers to the process that an enterprise issues shares to investors for the first time through a stock exchange in order to raise funds for enterprise development. When a large number of investors subscribe for new shares, they need to draw lots for allotment, which is also called drawing new shares. Investors who subscribe expect to sell at a price higher than the subscription price. In the environment of China, listing can be divided into three ways: China companies are listed in China or Shenzhen Stock Exchange (A shares or B shares); China companies go directly to overseas stock exchanges (such as new york Stock Exchange, Nasdaq Stock Exchange and London Stock Exchange) (H shares); China companies indirectly set up offshore companies overseas and listed on overseas stock exchanges in the name of offshore companies (red chips).