Passive safety net by a wire rope or ring network (need to intercept small additional layer of wire grill when rockfall), fixed system (anchor, anchor rope bar, dock and support rope), pressure ring and steel columns four major parts. Combination of steel columns and steel wire rope connected to form a whole, for the protection of the area to form a protective surface, thereby preventing the collapse of falling rock soil, slope protection play a role. Flexibility and strength of passive safety net to intercept the pass enough to absorb and disperse impact energy rockfall 500KJ less energy dissipation ring design and the use of the system has been further improved impact resistance SNS passive safety net compared with the rigid pulp interception and build retaining walls changed the original construction process, so that the duration and funding reduced. Passive safety net is suitable for building facilities near the buffer zone of high mountains, the rock fall, flying rocks, avalanches, mudslides blocked from building facilities to avoid disaster destroyed the building facilities. Material: steel wire rope, rope and decompression support ring structure: (additional layer of wire grill when needed to intercept small rockfall) by wire rope or ring network, fixed system (anchor, anchor rope bar, dock and support rope) four main parts constitute pressure ring and steel columns.