According to the provisions of China's contract law, legally established contracts are protected by law, but in practice, there are many cases in which contracts are invalid, which will infringe on the interests of the parties to the contract.

According to the provisions of China's contract law, the contract is invalid after signing, including fraud, the content of the contract violates the law, and the parties to the contract do not have civil capacity.

People's Republic of China (PRC) Contract Law is stipulated by relevant laws.

Article 8? A legally established contract is legally binding on the parties. The parties shall perform their obligations as agreed, and shall not alter or terminate the contract without authorization. Contracts established according to law are protected by law.

Article 9? To conclude a contract, the parties shall have corresponding capacity for civil rights and capacity for civil conduct. The parties may entrust an agent to conclude a contract according to law.

Article 42? In the process of concluding a contract, if any of the following circumstances causes losses to the other party, the parties shall be liable for damages:

(1) Concluding a contract under the guise of malicious negotiation;

(2) Deliberately concealing important facts related to the conclusion of a contract or providing false information;

(three) there are other acts that violate the principle of good faith.

Article 52? In any of the following circumstances, the contract is invalid:

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

(2) Malicious collusion that harms the interests of the state, the collective or a third party;

(3) Covering up illegal purposes in a legal form;

(4) damaging the public interest;

(5) Violating the mandatory provisions of laws and administrative regulations.

Extended data:

The legal effect of electronic signature is guaranteed by laws and regulations.

At present, Articles 13 and 14 of People's Republic of China (PRC) Electronic Signature Law recognize the legal effect of reliable electronic signatures; Articles 10 and 1 1 of People's Republic of China (PRC) Contract Law recognize that data messages can be used as the legal carrier of written contracts; Article 1 16 of the Supreme People's Court's Interpretation on the Application of the Civil Procedure Law of People's Republic of China (PRC) recognizes the legal status of electronic data as legal evidence.

According to the provisions of Articles 5 to 8 of the Electronic Signature Law, electronic contracts that lock the true identity of the signer, effectively prevent document tampering and accurately record the signing time are legally recognized.