Two high temperature imaging methods (sessile drop high temperature imaging and capillary high temperature imaging) and two calculation methods (droplet sphere layer iteration method and droplet spherical contour curve integration method) for measuring the density of glass melt were discussed. Then the high temperature density of the glass melt of the typical electronic yarn formula E for glass fiber was calculated by using the sessile drop method of high temperature imaging and the droplet sphere layer iteration method. The application of the high temperature density of the glass melt in the glass furnace technology and the glass high temperature characteristic testing technology were discussed.