行政契约是一种新型的行政管理方式，是游离于公法行为与民事契约之间的一种特殊形态。

Administrative contract is a new type of administrative pattern, and it is a special pattern between public law and civil contract.

youdao

至于导致行政契约无效的具体情形，则可从行政契约的公法属性、私法特性及自身特点三个方面来考察。

As for the detailed conditions of causing invalidation of administrative contract, it can be scrutinized from three aspects: nature of public law, character of private law and its own characteristics.

youdao