Five-step quality control system proposed by the inspection online, covering supplier audit, pre-production inspection, production inspection, pre-shipment inspection and shipment supervision of the five core links. In this paper, an in-depth analysis of the whole process of third-party inspection services to help buyers avoid quality risks, to ensure that the product from the source to the shipment of the whole process can be controlled. If you are confused about the inspection process, inspection service selection, this article will provide you with a clear guidance program.