Legal analysis: generally, the project quality auditor cannot sign. If the contract is clear, documents that can only be signed by the project manager, such as project implementation documents, cannot be signed by others. The review of project quality control refers to the process that an accounting firm can make a major judgment on the project team or make an objective evaluation of the conclusions formed when preparing the report before issuing a specific report.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.