Colorful film is a kind of film made by co extrusion and superposition of multi-layer polyester. It makes full use of the principle of light interference. Under the illumination of light, the refraction and interference between layers replace the multi angle layer color change between layers. The colorful film is saturated in color, bright and lively, with permeability. It can be used after being compounded with a variety of materials to meet a variety of design needs. It is an ideal new building material work with modernity, luxury, elegance and beauty.