1 One party enters into a contract by means of fraud or coercion, which harms the national interests;

Malicious collusion, harming the interests of the state, the collective or the third party;

3. Covering up illegal purposes in a legal form;

4. Harm the public interest;

5? Violation of mandatory provisions of laws and administrative regulations.

Extended data:

Article 144 A civil juristic act performed by a person without capacity for civil conduct is invalid.

Article 145 A civil juristic act that is purely beneficial or suitable for a person with limited capacity for civil conduct is valid; Other civil juristic acts shall take effect with the consent or ratification of the legal representative.

The other party may urge the legal representative to ratify it within one month from the date of receiving the notice. If the legal representative fails to express it, it shall be deemed as refusal to ratify it. Before a civil juristic act is ratified, the bona fide counterpart has the right to revoke it. Revocation shall be made by notice.

Article 146 A civil juristic act by the actor and the counterpart with false intention is invalid.

The validity of a concealed civil juristic act with false intention shall be handled in accordance with relevant laws and regulations.

Article 147 The actor has the right to request a people's court or an arbitration institution to cancel a civil juristic act committed due to a major misunderstanding.

Article 148 If a party causes the other party to commit a civil juristic act against its true meaning by fraudulent means, the aggrieved party has the right to request the people's court or an arbitration institution to cancel it.

Article 149 If a third party commits a civil juristic act against its true meaning due to fraud, and the other party knows or should know about the fraud, the defrauded party has the right to request the people's court or an arbitration institution to cancel it.

Article 150 If one party or a third party coerces the other party to carry out a civil legal act against its true meaning, the coerced party has the right to request the people's court or an arbitration institution to cancel it.

Article 151 If a party takes advantage of a person's danger and lacks judgment, resulting in obviously unfair when a civil juristic act is established, the injured party has the right to request the people's court or an arbitration institution to cancel it.

References:

Baidu Encyclopedia-General Principles of China People and State Law