Visual inspection of appearance: Visual inspection of appearance and flatness shall be carried out one by one. Size inspection: the size and deviation of the grid plate of the power plant operation platform should meet the requirements of the standard and the relevant provisions of the supply contract. Performance test: The manufacturer shall regularly sample the products for load performance test, and provide test reports according to users' requirements. Packaging, marking and quality certificate. Packaging: Grid plates of power plant operating platforms are generally packed with steel belts, and the weight of each bundle is determined by both parties or manufacturers. With the consent of both the supplier and the demander, the supplier can pack as required by the demander. Marks: The packing marks of grid plates of power station operation platform shall be marked with trademarks or manufacturer's codes, models and standard numbers, and each grid plate shall be marked with a number. The product quality certificate shall indicate the standard number, steel number, model and specification, surface treatment, appearance and performance test results, weight of each batch, etc. The quality certificate shall be delivered to the user together with the product packing list as the acceptance basis. If users have requirements, they can provide quality assurance of raw materials.