Using the laser granularity survey technology, X-ray powder diffraction, scanning electron microscopy (SEM) and infrared spectrum analysis methods, we studied the microscopic structure and chemical bonds changes of β-C_2S monomineral under the high energy ball grinding function. The result indicates that, continuously under the mechanical power, β-C_2S crystal size would decrease, the micro strain and the effective Beff parameter would increase, and the amorphous phases would be presented. Furthermore, the mechanical power would cause Si-O bond broken and reorganized, the specific surface area would increase, the energy of micro-powder agglomeration vibration would be enhanced and the crystal would be disordered. Finally, β-C_2S was caused to have the mechanochemical change and the activity enhancement. Using the laser granularity survey technology, X-ray powder diffraction, scanning electron microscopy (SEM) and infrared spectrum analysis methods, we studied the microscopic structure and chemical bonds changes of β-C_2S monomineral under the high energy ball grinding function. that, continuously under the mechanical power, β-C_2S crystal size would decrease, the micro strain and the effective Beff parameter would increase, and the effective phase would would presented. Furthermore, the mechanical power would cause Si-O bond broken and reorganized, the specific surface area would increase, the energy of micro-powder agglomeration vibration would be enhanced and the crystal would be disordered. Finally, β-C_2S was caused to have the mechanochemical change and the activity enhancement.