Legal analysis: only the unit seals, and no one signs on behalf of the company. Because the administrative seal and contract seal of a unit can completely represent a company, a contract or agreement stamped with the seal of the company is enough to be considered as the true expression of the company. The seal here should be a seal that has been applied for engraving and filing by the public security organ. If it is a private seal, it cannot represent the company in principle. At the same time, the private engravers and users of official seals should be investigated for corresponding administrative responsibility and even criminal responsibility. In judicial practice, the people's court generally adopts the principle of "recognizing the seal but not the person" to judge the validity of the contract. Therefore, any unit should strictly supervise the seal to avoid a small mistake that will cause irreparable losses to the unit. If the civil code person does not sign and seal, you can refer to the above contents.

Legal basis: Article 7 of the Negotiable Instruments Law of People's Republic of China (PRC) is signed, sealed or signed and sealed. The signature of the legal person or other organization that uses the bill shall be the signature of the legal person or other organization plus the signature of its legal representative or its authorized agent. The signature on a bill of exchange shall be the real name of the party concerned.