The Fruits and Vegetables diversacut dicer is composed of impeller roller, circular knivess and crosscut knives. The mismatch of the rotationl speed ratio and the unsuitable central position arrangement between the impeller and the crosscut will directly affect the quality of the diced section which is apt to appear marked arc, incline and so forth. Therefore, In this paper, using the virtual prototype technology to build the 3D model of fruits and vegetables diversacut dicer, and import it into ADAMS (dynamic analysis software of mechanical system) to simulation analyze the different shape of diced section when changing the rotationl speed ratio from 0.11 to 0.22 and the central horizontal spacing between the impeller and the crosscut vary from 260mm to 310mm. The results indicated that the mismatch between the impeller speed and the crosscut speed is the main factor which causes the incline surface during dicing process. If the central horizontal spacing between the impeller and the crosscut set at 280mm, 285mm, 290mm, 295mm, 300mm, and the rotationl speed ratio set at 0.11, 0.13, 0.16, 0.18(0.19), 0.21, the optimal diced section can be acquired so as to provide a basis for improving the diced quality.