A risk assessment model for listed company supply chain based on conditional risk value (CVaR) is proposed. Risk effect factor values are given by business scale between the upper and the down stream enterprise and manufacture. This method not only solves the problem that all kinds of risk factors should be measured in the study of risk evaluation on supply chain, but also designs risk threshold to implement risk supervision. Then a simulative example of China's color TV list company supply chain is given to show how to apply the model.