The previous studies mostly explored the return on IPO firms, but this study specifically investigates their risk. Information asymmetry is more serious in IPO market, where the risk characteristics may be different from the literature which investigates in the common environment. This study adopts two indicators, ”uncertainty” and ”possibility and degree of unfavorable results” to evaluate the risk. The empirical results indicate that these two risk indicators are mostly equivalent, and the factors of low uncertainty are also the significant characteristics of the firms whose value remains below their offering prices. Besides, the IPO firms certified by the big CPA firms have higher risk, which is inconsistent with the literature based on the common conditions. This shows information asymmetry may have great effects on the enterprise risk.