Abstract: In order to improve the anti- vibration capacity of the cutting gearbox casing applied on the boom type roadheader, a finite element method and a model experiment were applied to study the casing model. Taking a cutting gearbox of a roadheader as an example, the Solidworks was applied to establish a 3D model of the gearbox casing. Then the 3D model was applied to the Workbench for the analysis on the pre- stressed restriction model. The casing inherent frequency and vibration mode of the former 6 stage were solved. Meanwhile a model experiment was conducted on the gearbox casing. The results showed that the gearing frequency of the ge ar was obviously lower than the inherent frequency of the casing, and the resonance occurred was avoided. The results of the finite element method and the model exp eriment were well fitted.