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Nine kinds of rotary cutter with different parameters were designed. The cross experiment of three factors on three levels was made in order to find out the most reasonable parameters of rotarycutter on 6BX-40 ramiestripping machine. Through analyzing the parameters influence on three indices—the loss rate of fiber, glue content in fiber and power consumption, a better parameter group was found out: the rotarycutter diameter was 45mm, blade teeth helix angle was 4°, blade teeth front angle was 8°. The stripping experiment showed that the loss rate of fiber was 4.3%, glue content in fiber was 25.8%, power consumption was 0.92kW, when the rotarycutter cutting speed was 1.2m/s, bark transportation speed was 0.6m/s.