According to Article 38 of General Principles of Civil Law of People's Republic of China (PRC) and General Principles of Civil Law of People's Republic of China (PRC): "According to the law or the articles of association of a legal person, the person in charge who exercises authority on behalf of a legal person is the legal representative of the legal person."

The legal representative shall exercise his functions and powers on behalf of the legal person, and the legal person shall bear the responsibility for the acts done in the name of the legal person. The official seal is not a necessary condition for the validity of the contract.

In addition, Article 52 of the Contract Law of People's Republic of China (PRC) stipulates five situations in which a contract is invalid, and the legal representative's signature on the contract without the official seal of the company is not one of them. Therefore, the legal representative signed the contract without the official seal of the company, and the contract is valid.

The power of attorney of a legal person must be stamped with the official seal of the unit and signed by the legal representative. If there are reasonable reasons why the signature of the legal representative cannot be provided, it may not be provided, but in order to maintain the rigor and accuracy of the case file, the signature of the legal representative may be provided at the request of the counterpart. If there is only the signature of the legal representative without the signature of the unit, the power of attorney of the legal person is invalid.