Optical microscope, high temperature microscope, TGA and XRD were used to study the influence of sand particle size on the process of batch melting. Optimized particle size range was obtained. Coarse sand has bad influence on glass melting. Finer sand has complex influence on glass melting. The sand size should be controlled from 26 to 150 meshes. Particles from 120 to 150 meshes should be controlled within the content(in mass) of 1% to 2%.