Legal analysis: In current legislation and judicial practice, examining whether a legal person's official seal is affixed has become an important criterion for judging whether a civil activity is established and effective. If it is a true expression of intention, it is generally valid.

Legal basis: Article 44 of the "People's Republic of China and Civil Code" A contract established in accordance with the law shall take effect from the time of establishment. If laws and administrative regulations stipulate that approval, registration and other procedures must be completed to take effect, such provisions shall apply.