不正当影响是由衡平法本着公平正义原则发展而来的一种确认合同效力的制度,它不仅为英美法系国家广泛运用,而且也开始为大陆法系国家吸收和借鉴。我国合同法未对不正当影响进行规制,而英美法上的判例实践所形成的原则对我们处理类似的情形具有借鉴的作用。 The improper influence is a system of confirming the validity of the contract, which is derived from the principle of fairness and justice based on equity. It is not only widely used by common law countries, but also started to be absorbed and used by civil law countries. The contract law of our country does not regulate the improper influence, but the principle formed by the case practice in the common law of the United States and the United States has reference for us to deal with similar situations.