Knocking on the wall and pulling the protective net can stop falling people and things, and avoid or reduce the damage caused by falling and object impact. The purpose of erecting nets is to prevent people or things from falling. The strength of the net must be able to withstand the longitudinal tension and impact strength of the weight and impact distance when the human body and carrying tools fall.

Safety net is a kind of labor protection equipment to prevent falling injury, which is widely used in all kinds of aerial work. The hidden dangers of falling during aerial work often occur in shelves, roofs, windows, suspensions, deep pits and deep ditches. The degree of fall injury varies with different falling distances, ranging from disability to death.