The Sugarcane field excitation has notable influence on the sugarcane cutting quality, but its mechanism has seldom been studied. Based on the dynamic model analysis, this paper measure, analysis and test how the field excitation impacts the vibration of the cutter. After building up 3D model of the vehicle and field system, virtual simulation analysis on it is carried out, deducing that the frequency of field unevenness has notable influence on the vibration of the cutter. In physical experiment, it compares and analyzes the vibration of the cutter and cutting quality under different frequencies of field unevenness. The result shows that, the frequency of field unevenness has magnificent influence on the vibration of the cutter, and the higher the frequency the more deteriorated the sugarcane cutting quality.