SNS (safety netting system) Fence active protection is an open system to reinforce slopes. Considering it's merits-easy to install, high efficiency, low cost and artistic effect on slopes, it has been widely used in many fields of domestic industries, such as hydropower station, civil transportation and mining engineering. The SNS flexible protection mesh overcomes the inconvenience of traditional ways to reinforce slopes, improves the effect of the vegetation, and becomes a developing method with ecological and social benefits.