Method for reducing transparent hard coating film rainbow veins used for intramode decoration

The invention relates to a method for reducing transparent hard coating film rainbow veins used for intramode decoration. In the method, the film is composed of a base film layer and a hardened layer coated on the base film layer; the thickness dj of the hardened layer is determined according to the following relation:, dj is the thickness of the hardened layer, nj is refractive index of the hardened layer, nj+1 is refractive index of the base film layer, lambda is wavelength of incident light, numerical value of lambda is 550nm, i is incident angle of light, numerical value of i is 30 degrees, and k is a natural number. The invention controls the thickness of the hard coating film, so as to control optical path difference of reflected lights of upper and lower interfaces of the hard coating film, so that lights reflected from the surface of the hard coating film are mutually interfered and cancelled, rainbow vein is effectively reduced, visuality is improved, and meanwhile the hard coating film can meet the