This is part of the regulatory regulations. The supervision unit shall not subcontract the supervision business, because the supervision unit shall not transfer the supervision business, and the engineering supervision unit shall perform the supervision task objectively and fairly according to the entrustment of the construction unit. According to Article 34 of the Construction Law of People's Republic of China (PRC), the engineering supervision unit shall undertake the engineering supervision business within the scope of supervision permitted by its qualification grade. The engineering supervision unit shall, according to the entrustment of the construction unit, perform the supervision task objectively and fairly. The project supervision unit shall not have affiliation or other interests with the contractor, building materials, building components and equipment suppliers of the supervised project. The project supervision unit shall not transfer the project supervision business.