There is an important thing you have to know about the principle: the precise status of promissory estoppel.It is not only a fantasy academic problem, but also has profound practical implications.

• 关于允诺禁止反言理论，有一个尤其值得关注的问题，那就是理论的性质，对于理论性质的不同认识会导致构成要件、救济方式等具体适用方面的差异。