Legal analysis: effective. If the parties sign a contract in writing, the contract will be established when it is signed or sealed. The legal representative is the person in charge who exercises authority on behalf of the company according to the law or the articles of association. The legal representative shall exercise authority on behalf of the legal person, and the legal person shall be responsible for the acts carried out in the name of the legal person. The official seal is not a necessary condition for the validity of the contract. In other words, the legal status of the legal representative determines the source of his right to exercise his functions and powers, which are endowed by law and have legal effect. Therefore, the agreement signed by the legal representative shall be deemed as valid, and the legal consequences shall be borne by the legal person.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 61 In accordance with the law or the articles of association of a legal person, the person in charge of civil activities on behalf of the legal person is the legal representative of the legal person. The legal consequences of the legal representative's civil activities in the name of a legal person shall be borne by the legal person. The restriction of the legal representative's representation by the articles of association or the functions and powers of the legal person shall not be against the bona fide counterpart.

Article 62 If a legal representative causes damage to others when performing his duties, the legal person shall bear civil liability. After a legal person bears civil liability, it may claim compensation from the legal representative at fault in accordance with the law or the articles of association of the legal person.

Article 504 A contract concluded by the legal representative of a legal person or the person in charge of an unincorporated organization exceeds its authority, unless the other party knows or should know that it has exceeded its authority, the representative's behavior is valid, and the contract concluded is valid for the legal person or unincorporated organization.