Protective ring network using hot dip galvanizing process, the process can happen rockfall impact their geometry change, with a more prominent feature of the flexible ring to replace the wire rope safety net, as a basis for blocking stone network can achieve more than 3000kJ rockfall block, and can further simplify the structure of the form (such as rope and configuration support ring vacuum) to facilitate the maintenance of local repair after damage ring safety net has become a new alternative to wire rope system stopped stone network (RXI-type), achieve the replacement and upgrading of SNS passive protection systems. Circular Fence Features: 1, can occur when the impact ring hole geometry deformation ring network detailed picture 2, showing more favorable characteristics of three flexible and more powerful energy absorption capacity of 4, to achieve more than the kinetic energy of up to 3000KJ rockfall * 5, greater flexibility in working range 6 to replace a smaller maintenance needs 7, mutually independent ring socket holes between 8 and partial damage repair easier and more economical