Sunshine propagates in a straight line. After encountering a shading net, it will reflect some of the sunlight out because it has the ability to absorb ultraviolet rays, and some of the heat will be absorbed. Because black is the best at absorbing heat, shading nets are generally black. If it is used for shading and cooling in courtyards, other colors such as green can generally be used for aesthetics. The difference in shading effect is not very obvious, but the environmental beautification effect has been greatly improved. The shading net is densely covered with mesh, which can maintain air circulation for ventilation and heat dissipation.