The Estoppel of Anglo-American law system, which is a substitute and supplement of consideration, is the result of application of the principle of good faith and equitable idea in order to protect transaction security.

• 摘要英美法系的禁反言规则，是对价理论的代替物和补充，是诚实信用原则与衡平理念适用的结果，目的是保护交易安全。