用结构化模型处理公司违约风险，考虑可展期债券在首期到期日，发行公司有权根据当时公司的信用等级决定是否将债券到期日延长。用偏微分方程的方法给出了可展期的企业债券定价的公式，并讨论了它与普通债券在收益率上的差异。难度在于计算名义到期日前公司不违约的概率以及在此条件下公司资产的条件分布。%This article deals with the credit risk by the structural form approach.The firm has an option of extending maturity by the firm′s credit rating on the nominal expiry date .We obtain a pricing formula for the firm bond with extendable maturity the PDE approach and compare its return rate with that of the ordinary firm bond.The difficulty is to calculate the probability of de-fault before the nominal expiry date and the conditional distribution of assets of the company under this condition.
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