The window screen resist chemical corrosion of acid, alkali, etc. resisting light-aging and weather problems; high strength of tensile; dust proofing; flame proofing, static and ultraviolet resistant; low coefficient of heating expansion and coldness shrink, proper meshes, good capability of permeating air, high rate of permeating light, good fastness, non-move of warp and woof, beautiful façade, durable quality, and easy washing.