A defoaming process for the treatment of foam layer in an oxy-fuel combustion glass furnace is proposed,which can improve the quality of glass. Because of the continuous diffusion and penetration of defoamer with low surface tension between the gas-liquid interface, which makes the membrane wall thin quickly. And the foam is strongly pulled by the surrounding film with high surface tension, so that the stress imbalance around the foam, leading to the "bubble breaking", so as to achieve the purpose of eliminating foam. This technology can reduce production energy consumption, save production costs and provide some useful reference.