Legal analysis: verify the quantity signature and check clearly. The project visa form must be signed and sealed by the site supervisor and Party A .. to be effective. Because the visa form must be examined by the supervisor. Without the signature of the supervisor, it cannot be used as the basis for settlement. The supervision work contact sheet is sent by the supervision department to all units, which can be sent to the owner, design unit or construction unit, and can also be sent to the survey unit.

Legal basis: Article 791 of the General Principles of the Civil Law of People's Republic of China (PRC), the employer may conclude a construction project contract with the general contractor, or a survey, design and construction contract with the surveyor, designer and constructor respectively. The employer shall not dismember a construction project that should be completed by one contractor into several parts and contract it to several contractors.

The general contractor or the contractor for survey, design and construction may, with the consent of the employer, entrust part of its contracted projects to a third party. The third party shall be jointly and severally liable to the Employer with the general contractor or the survey, design and construction contractor for the work results it has completed. The contractor shall not subcontract all the construction projects it contracted to a third party or subcontract all the construction projects it contracted to a third party in the name of subcontracting.

It is forbidden for the contractor to subcontract the project to units that do not have the corresponding qualifications. Subcontractors are prohibited from subcontracting contracted projects. The construction of the main structure of the building project must be completed by the contractor himself.