Steel ring net system is passive protection system. The steel ring net system main consists of steel ring nets and chain link fences. Sometimes, the steel wire ring net can be used with hexagonal wire mesh. The steel wire ring net is combined with several steel rings. The steel rings are made of high tensile steel wires. Single steel wire are looped with ends inserted into the thread or secured by one or more than one ferrules. The ferrules can be steel or aluminum alloy. They are distributed on the rings evenly on three points. The rings are interlocked each other to supply high bear and load capacity. Each ring is connected with four or six contiguous rings in order to create a stable and solid ring net. The steel ring net is more flexible than the steel rope net.