The invalidation of administrative contract is that administrative contract doesn t have efficiency from the beginning because it has evident and serious defect or has legal invalid conditions.

This paper,beginning with the basic conception of the invalid,cancellation and amendment of administrative action,explains the relation among them with simple analysis on the three theories to offer theoretical support for corresponding regulations.

The trend of the contract validity system evolution in our country is that the principle of autonomy of will increasingly comes into actual effect,that the principle of public order and good moral is carried out more and more reasonably,that the principle of trade encouragement has the effect gradually and that the range of invalidity is reducing and the validity is more diverse.

In addition to the general effective conditions that general contract shall have,the arbitration agreement shall have some special effective conditions;otherwise,it becomes invalid.

This article discusses invalidity,an important,effective and usually used defense in defenses of patent infringement and corresponding issues and put .

The invalidity, cancellation and correction of an administrative behavior is an action taken against an illegal administrative behavior and an remedy of legal duty.

Perfecting the System of Void Marriage and Recalling Marriage in China;

The fraudulent administrative decision is void which people need not abide by and the administrative agency should not carry out.

Guaranty contract would be null and void not only because of its own factors but also because of being null and void of the principal contract.

Suretyship contract would be null and void not only because of being null and void of the principal contract but also because of its own.