Using parametric design of SolidWorks, three-dimensional solid models of all parts of 9YG-130 double disc mower cutter were built, and the design of virtual prototype was completed by constraint assemble. Introducing the models to the dynamic analysis software ADAMS, the motion simulation was performed, and the trajectory of the cutter vertex was obtained when setting the forward speed of the cutter with 2.78m/s, and rotation speed with 2000r/min. The virtual orthogonal experiment with three levels and four factors was conducted, and Design-Expect 8.0 software was used to complete analysis of variance. The results showed that the repeat cut ratio of the cutter was effectively reduced when the four factors were vg=57.01m/s, vj=2.76m/s, h=34.06mm, and m=3. The actual prototype experiment results showed that the experiment design met the mower requirements for grass industry technology, and improved efficiency and accuracy of the design.