Legal analysis: for a contract signed by only the legal representative, the validity of the contract cannot be denied on the grounds that the official seal of the company is not affixed. As long as it is confirmed that the performance of the contract is the true intention of both parties, there is no lack of capacity, there is no special agreement on the validity of the contract, the authenticity of the signature or seal can be proved, and the law and social public interests are not violated, the contract should be considered valid and both parties should perform their obligations according to the contract.

Legal basis: Article 61 of the Civil Law of People's Republic of China (PRC) According to the provisions of the law or the articles of association of the 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.