Abstract: In order to improve the smashing efficiency and reduce the energy consumption of the micro-comminution muller for carrot, based on the mechanical properties of the dried carrot, the better smashing method, the shearing grinding method was determined with carrot piece moisture content of 5%. Based on above research, 3 kinds of smashing cutters (the single edge smashing cutter, the double edge smashing cutter and the teeth-formula smashing cutter) were designed. The stress analysis of material and the smashing cutters showed that the biggest stress was smaller than the yield stress. and the cutters worked stable and was not easily ruptured. The smashing cutter type, the rotor speed and the cutter bottom gap were taken as influence factors, the energy consumption per unit powder output was taken as experimental target. The test results indicated that the energy consumption per unit powder output comminuted by the teeth-formula smashing cutter was the highest, followed by the double edge smashing cutter and single edge smashing cutter. The optimum technique and parameters of the micro-comminution for carrot were that using teeth-formula smashing cutter, the rotor speed was 1?455 r/min, the cutter bottom gap was 7 mm, under which the maxmum output per unit energy consumption could obtained with 120 mesh carrot powder. The research can provide a reference for carrot micro-comminution design.