The application of the internet technology on securities markets has been increasing over recent years, so is the influence it has caused on the way the stock market is operated. There is no doubt that internet technology is changing the access between investors and issuing firms, as well as the access between investors and exchanges. How would this affect the stock market microstructure? Little study has been done thus far in this regard, and, as far as we know, none has looked into the issue of IPOs on internet and its related impact on IPO returns. In addition to the impact on the primary market, internet tradings also have immense impact on the underlying performance of the secondary market. The purposes of this study are mainly twofold:(1) To explore the related issues in IPOs or DPOs on internet, e.g., the disclosure requirements, the restriction of investors, and the effect it has on IPO discounts,(2) To empirically test how the internet trading affects the daily and intraday performance (i.e., liquidity, volatility and efficiency) of the market.This is the first study attempting to examine the pricing issue of IPOs on the internet. We hope to compare the returns of initial public offerings on the internet with those of the traditional IPOs and analyze the differences, if any. In addition to provide useful analyses to the security authority on DPOs or IPOs on internet, the result of this study should contribute to our understanding of the market microstructure.