Barbed wire is a barrier net made by twisting a barbed wire around a main wire (strand) through a variety of weaving techniques. Three kinds of twisting methods for barbed wire: twisting, reverse twisting, twisting positive and negative. Screwing method: It is to twist two iron wires or multiple wires into double wire ropes and then twist the ropes around the double wires. Anti-twisting method: Firstly, the thorn wire is wound on the main wire (that is, a single wire), and then a wire is added and twisted into a double-stranded thorn wire. Positive and negative twisting method: It is the twisting of the direction in which the direction of the ground wire of the main wire of thorns is reversed. Not twisting in one direction