Nano grain size yellow tungsten oxide may be applied for manufacturing nano-ceramic color master, and then be used to prepare heat insulating film, and therefore be applied in heat insulating glass with excellent spectral selectivity and stability. Thus, the glass will have remarkable heat insulating effect to block radiation of light wave. The overall shielding rate of near infrared rays is as high as 90%, and the visible light transmittance is over 70%. Heat insulation principle of yellow tungsten oxide…