Legal analysis: the current laws and regulations do not stipulate that the relevant personnel of engineering construction shall not use signature and seal to confirm the relevant information. But we must pay attention to the following aspects: whether it is autograph or signature and seal, it is the proof that the parties confirm the work related to the project construction. The parties shall confirm it after performing their duties.

Legal basis: Article 165 of the Civil Code of People's Republic of China (PRC) * * * If the power of attorney is in written form, the power of attorney shall specify the agent's name, agency matters, authority and time limit, and shall be signed or sealed by the client.