What is the use of the supervision training certificate issued by the Water Conservancy Engineering Association? What's the difference between the usual supervision certificate? There is no relevant information. Please give me some advice! There are many kinds of supervision certificates (industries), such as highways, railways and water conservancy. Of course, the most frequently mentioned supervision certificate is managed by the local government construction management department, which is what you usually call supervision certificate. It can be said that the former category is released by the industry and can be regulated in its own industry, while the latter category is universal and can be regulated in almost all industries.