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The dSPACE is a software and hardware real-time control platform based on MATLAB/Simulink. In this paper, dSPACE single board system DS1103 is used. By using Rapid Control Prototyping, the online simulation is carried on internal model control for double-loop DC speed regulating system. After creating control system structure in Simulink, the control system frame can be compiled and downloaded to dSPACE real-time hardware system by RTW/RTI. The motor drive movement process can be monitored and the controller parameters can be adjusted online to improve the systempsilas performance with ControlDesk software. The experiment shows that the real-time platform proved by dSPACE can construct the control system model and complete the systempsilas debugging conveniently.