Abstract: In order to improve the efficiency and reliability of robot design, the authors utilize and predigest the interface between ADAMS and MATLAB and add a motor simulation block in MATLAB/ SIMULINK, thus remedying the insufficiency of rigid motor in ADAMS and successfully simulating the mechanical arm of a two DOF plane robot. The radial error is less than 0.065 mm and the error of the end point is less than 0.060 mm. The result of simulation shows that this robotic simulation method is practical.