Abstract: The physical process to fabricate hollow glass microspheres(HGM) by the Liquid Droplet Method in a 7-meter-high multi-zone high temperature furnace has been modeled mathematically. And the model quantitatively describes the whole process, through which the main parameters of the droplets/membrane spheres/HGM including the velocity, the sizes, the glass-forming oxide mass, the wall-thicknesses, and the inner gas pressures of vapor and air inside can be calculated. Calculation has been done under a series of operation conditions, especially at different purge gas rates, initial concentrations of the blowing agent and those of glass-forming oxides in the glass-forming solutions, and sizes of the initial droplets. The calculated results are to some degree in good agreement with the experiments