Rigging user's safety technology quality is low, poor safety awareness, rigging user's safety technology quality and safety awareness is not strong, not only affect the quality of lifting operations, directly affect the safety of users. Its performance is mainly the following points, one is the user's safety awareness is weak. Tensioner manufacturers in the production process, some spreader users again production, light safety, progress-oriented, grasp the deadline, simplify the process of operation, and even because of illegal risky operations and accidents. Fiber belt tensioner part of the use of personnel safety and technical quality is low, they do not understand the basic performance of the rigging and the use of requirements, more how to calculate the center of gravity of the hanging object and the exact method of suspension, and then the specific operation, at will, Wuxi S hook tensioner understand whether the safety of the hammock can be guaranteed, relying entirely on the "big luck".