Virtual enterprises not only help to improve the competitiveness of enterprises but also increase the risks that enterprises face. This paper studies the methods and indexes for enterprise risk evaluation and steps of virtual enterprise risk identification and adjustment, constructs a local optimization model and global optimization model of virtual enterprise risk based on minimum risk loss and finally gives a risk control framework of virtual enterprise. Virtual enterprise is also called virtual organization or dynamic alliance, etc, and it refers to a dynamic alliance of multiple enterprises taking information network technology as support to integrate their respective core competences and resources for catering for fast-changing market opportunities. Virtual enterprise brings advantages of flexibility and quick reaction, etc, but we can not neglect its risks and losses brought by the risks due to uncertainty of external market environment and its complexity and even these risks and losses will lead to its abortion. Under the circumstances, we need to carry out effective identification and control of virtual enterprise risks to ensure the successful establishment and operation of virtual enterprises.