There are three categories of posts used in long-distance pipeline projects: mileage posts, horizontal corner posts and marker posts. To make complete and clear identification of pipelines, facilitate management, prevent vandalism and meet standardization requirements, it is necessary to set up three categories of posts plug signs for long-distance pipelines, and the posts are mileage posts/cathodic protection test stations, marker posts (corner posts) and additional posts.The traditional "three categories of posts" consume a lot of manpower of the owner enterprises for inspection and maintenance; post damage, displacement or loss cannot be identified timely; inspectors need to collect cathodic protection test data on site, making it difficult to the loss of protection in a timely manner. Therefore, there are risks in maintaining the pipeline intact.