It is valid if the following conditions are met:

1. When concluding a contract, the parties must have the corresponding ability to conclude a contract.

2. The intention of the parties to the contract is true.

3. The contract does not violate the law or public interest. Under normal circumstances, the contract can be established and take effect only by stamping, without the signature of the legal representative or representative of the company. That is to say, under normal circumstances, the contract is only sealed. After the conditions for entry into force are met, there is no legal risk without the signature of the legal representative or representative. However, under special circumstances, if the contract is stamped with a fake official seal without the signature of the legal representative or representative, it is difficult to identify who stamped the official seal, that is, it is difficult to investigate the person who used the fake official seal.

Legal basis:

Article 490 of the Civil Code of People's Republic of China (PRC): If the parties conclude a contract in the form of a contract, the contract is concluded when the parties sign, seal or fingerprint it. 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.