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Electro-mechanical heterogeneous modeling and simulation technique, which is applied to NC machine tool, is one of the difficulties and important approaches to analyze dynamic performances. Based on mathematical model of servo motor with load, the horizontal feed system of the complex NC machine tool from gear milling and hobbing was taken as a research object to set up mechanical dynamic model by ADAMS/View and establish control model in MATLAB/Simulation. The electro-mechanical heterogeneous model, which is made up of the mechanical dynamic model and the control model by ADAMS/Controls, was simulated in MATLAB7.0. The simulating results show the validity of the dual closed-loop control project composed of speed loop and position loop. Furthermore, the control moment characteristic of the AC servo motor with load was analyzed, which offers a theoretical basis for drive design as well as electro-mechanical parameter matching of the NC machine tool.