信用利差期权（Credit spread option）
信用利差是用以向投资者补偿基础资产违约风险的、高于无风险利率的利差，其计算公式是：信用利差＝贷款或证券收益－相应的无风险证券的收益

A financial derivative contract that transfers credit risk from one party to another. An initial premium is paid by the buyer in exchange for potential cash flows if a given credit spread changes from its current level.

The buyer of a credit spread option will receive cash flows if the credit spread between two specific benchmarks widens or narrows. Credit spread options come in the form of both calls and puts, allowing both long and short credit positions.

Credit spread options can be issued by holders of a specific company's debt to hedge against the risk of a negative credit event. The buyer of the credit spread option (call) assumes all or a portion of the risk of default, and will pay the option seller if the spread between the company's debt and a benchmark level (such as LIBOR) grows.

Options and other derivatives based on credit spreads are vital tools for managing the risks associated with lower-rated bonds and debt.