As long as the contents of the contract are legal and the conclusion process is legal, then the signed agreement is protected by law. Whether the letter of guarantee has legal effect should meet the following conditions: the guarantor belongs to a person with corresponding civil capacity; The meaning of both sides is true; The content of the guarantee is legal and does not violate the mandatory provisions of laws and regulations. The agreement or commitment written by the other party shall have legal effect as long as it conforms to the provisions of the other party on civil capacity and legal content and is signed by the other party. According to the regulations, the parties may conclude a contract in written form, oral form and other forms. There is no written contract between the parties, but if one party fulfills its main obligations and the other party accepts it, the contract shall be deemed to be established. Therefore, if only one party signs, but one party has fulfilled its main obligations and the other party accepts, the contract is also considered to be established. This agreement is signed by both parties on the basis of fairness and voluntariness and has legal effect. However, 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.
Is the agreement signed by both parties valid?
The agreement signed by both parties has legal effect. Unless otherwise agreed by both parties, this agreement shall come into force upon its establishment, and both parties shall begin to perform the rights and obligations agreed in the agreement.
Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.