Being viewed as a solution for quick introduction of a variety of products with high quality and low costs, especially for manufacturing industry, virtual enterprises attracts more and more interests currently. However, virtual enterprises, while bringing a lot of response flexibility to us, implies some unavoidable risks. In this paper, the possibility to avoid risk by utilizing dynamical contracts and building swift trust among partners in virtual enterprises is explored.Then a risk transfer algorithm is presented, as well as risk evaluating, bottleneck risk identifying, risk adjusting and optimizing is discussed by taking lead time risk as an example. Finally, a framework for risk scheck list designing and publishing based on Web is proposed for risk monitoring in virtual enterprises.