A backlight module provided by the present invention comprises a light source, an optical wavelength conversion film, a first group of optical films and a second group of optical films. The light source is applicable to emit a first ray of light. The optical wavelength conversion film is applicable to convert the first ray of light to a second ray of light with different wavelengths. The first group of optical films is configured between the light source and the optical wavelength conversion film. The optical wavelength conversion film is located between the first group of optical films and the second group of optical films, wherein the ratio of the penetration rate of the second group of the optical films with respect to the second ray of light and the penetration rate of the first group of the optical films with respect to the first ray of light is not less than 45%. Thereby, the backlight module is provided with uniform glaring colors.