Will affect the use of automatic safety net is not the same degree of production plants and equipment with a very cumbersome, due to the process of the device can not do maintenance every tree, otherwise automatic safety net will be unable device; a method to deal with this question is very simple, Auto safety net already can not play a lot of protective effect, we can choose a passive safety net, passive protection network device at the foot, but there rockfall falling division can stop them. It is common place that passive protection network. SNS flexible protection system main products can be divided into active and passive protection system protection system in two ways: as the main system components and rope to cover the (active protection) and * (passive protection) are two basic types to combat all types of slope slope flexible security system technology and product surface geological disasters and avalanches, slope erosion, blasting flying rocks, falling objects and other hazards.