Defensive barrier is a kind of modern stone cage for military defense. It is made of a foldable metal mesh container and heavy fabric lining, which is used as a temporary explosion or small arms barrier. The protective frame was originally designed for erosion and flood control of beaches and marshes, and soon became a popular safety device.

Defensive barrier is easy to assemble and firm in strength, and can be used in retaining wall structure, river regulation engineering, erosion and erosion protection, road protection, bridge protection, hydraulic structures, dams and culverts, coastal embankment engineering, rockfall and water and soil loss prevention.