Through the detailed investigation of the elevator installation construction site and the reasonable analysis of the accident site investigation results,it is inferred that there are a series of illegal behavior and construction management loopholes in the elevator installation process.Through calculation and analysis,it is proved that the danger of elevator erection exists without scaffold and the seriousness of accident consequence.The direct and indirect causes of the accident are obtained by comprehensive analysis,and it is clear that the elevator installation construction accident is not the accident caused by the special equipment itself,and the accidents caused by lax safety management of elevator installation construction should not be defined as the special equipment accident.