Abstract: A new physicochemistry method for producing fine-grade rubber power is introduced. The main factors influencing the effective time in producing fine-grade rubber power are also discussed. The experimental results show that the grade of rubber powder produced with physicochemistry method is much finer than that with conventional method. Prolonged grinding time, increased ratio of rubber-power /agent and decreased filling volume can lead to fine-grade rubber powder. The results also show that the mechanical properties of rubber powder by physicochemistry method are superior to that by conventional one, the tensile strength for 60-80 mesh grade rubber powder is the lowest, and for 140-200 mesh grade being the highest.