Signatures of educators, field team leaders, educatees and workers. In the three-level safety education, the three-level safety education is the safety education conducted by the team after the first-level and second-level safety education for new employees and outsiders. In the three-level safety education, it is necessary to introduce the safety production situation, hazard identification, safety operation procedures and emergency treatment of the team. In the three-level safety education, it needs the signatures of educators, on-site team leaders, educatees and workers.