In this paper, we introduce the theory of KMV model and its credit risk measurement process in detail.We use the iterative algorithm to calculate the asset of listed company and its volatility.

• 本文详细解释了KMV模型的原理及度量信用风险的过程，同时改进了模型的算法，采用迭代算法计算上市公司资产价值及其波动率；