Abstract: When a mini-type sugarcane harvester moves on the sloping field, its’ cutter suffers from violent vibration, which affects the cutting quality. The field roughness was measured by using the field spectrum with the method of measuring acceleration. The influence of the field roughness on vibration of cutter was analyzed and verified by simulation analysis of the virtual prototype. The results showed that the best cutting quality could be obtained when the blade speed was 600 or 1?000?r/min after experimental analysis. The results can provide a reference for the development of prototype.