This paper proposed a method for fabricating silicone rubber molds for low-pressure wax injection molding. The wax spilling is one of the most troublesome problems during wax injection molding process. From the point of view of green manufacturing, the optimal processing conditions in the wax injection molding process were investigated using Taguchi method. The experimental results revealed that the most influential factor affecting the weight of spilled wax during wax injection molding process is the injection time. The optimal processing conditions in the wax injection molding process are injection temperature of 82 ℃, injection time of 2 sec, injection pressure of 0.6 kgf/cm2 and mold temperature of 60℃.