1. Active Protection System is used mainly to the types of flexible steel wire rope net covered or wrapped in protective slope or rock need to limit the slope rock mass weathering or damage and the collapse of unstable rock (reinforcement effect), or rockfall control within a certain range of motion (envelope effect); subsequently be attributed to passive defense essentially a function, but in the SNS system due to its structure formation and play a role in strengthening the active protection system similar to remain classified as Active Protection, and both are known as active protection standards and master - passive protection and distinction. When the main - passive protection system covering the surface when blasting work, they formed a flying stone blasting prevent harm flexible security system. (1) the structure of Active Protection Network Active Protection System is close to the mountain diamond mesh, the loose stones pressed on the mountain, not to be applied in this way the stone cliff fall protection (2) Active Protection System constitutes 2, active protection system consisting of a flexible protective structure support rope, anchor, rope, etc., the entire system through steel rope, support rope, anchor the unstable rock and rock fused to form the overall force, three-dimensional protection. ① wire rope: rope, ten self withhold parts, fastener ② aim Rod: steel rod or wire rope aiming aiming rod ③ stitched rope: 16 rope wire mesh grille 3, SNS Flexible Active Protection System advantages 1, the system for the plant 2, and standardization of production, construction speed. Yan Ping Road tens of thousands of square meters of construction, only two months duration, and does not affect other construction projects simultaneously. 3, the system is easy to take advantage of flexible material spreadability and high anti-impact capability, through the system and the formation of a large number of field trials to adapt to all types of slope protection of geological disasters and natural slope of systematic techniques for engineering and quality control and accurate measurement of the amount of the project. 4, take full advantage of the characteristics of light weight and ease of processing to achieve high strength metallic materials, light system, parts production factory and building blocks installed in equipment as simple as possible, the shortest duration and minimal construction and installation work to achieve quick and easy to maintain, thus solving in complex mountainous terrain of traditional protective measures construction difficulties, slow progress in the long-term problem; and take advantage of the system's flexibility and construction layout to maximize flexibility to adapt to a variety of complex terrain environment, avoid or minimize environmental damage caused due to excavation and slope stability hazards, as well as interference to other jobs in and around the building to normal operations. 5, take full advantage of the openness of the system to reduce the system of visual disturbances and protect the existing vegetation and growth conditions, and to implement artificial afforestation may be provided, in order to take full advantage of the environment green vegetation roots slope reinforcement role and greenery landscaping function, project management and environmental protection and improvement of integration. 6, take full advantage of the technology is mature, cost-effective good metal corrosion coating technology, using galvanized steel wire rope and steel or zinc-aluminum coating to ensure corrosion protection system longer life, the former generally up to 30 to 50 years after by up to a hundred years, only a small number of components to extend the life of the replacement if necessary. (4) SNS active protection system standard application SNS active protection system commonly used in the standard slope collapse, boulders and falling rocks, weathering, Slough, slippery or slumping Geological Disaster reinforced protection, its distinctive feature is the use of the anchor system rod fixed and flexible, depending on the network, namely to achieve pretension in part through the support of flexible net and rope tensioning suture (wire rope and wire grill) or prestressed anchor (TECCO-65 grid), and thus the entire Slope form a continuous support, its pre-tensioning operation of the system as much as possible close to the surface and formed a movement or displacement or damage in the event of partial wrap tied after its vicinity (retention) of rock and soil in situ prestressed partial suppression, thereby achieve its active protection (reinforcement) function. The system in the construction process as close as possible to ensure that its slope, anchor orifice opening pits should be dug (due to system layout flexibility, often using natural low-lying position within the permissible range set anchor, thus appropriate to reduce the orifice pit dug).