Development of A&D-DSP application software is carried on based on the model based design concept.The framework of A&D-DSP is realized by placing MATLAB／Simulink／Stateflow in a center and utilizing AD-VirtualConsole (GUI) and MC Ladder as sub-frames. Real-time processing function and post-process analysis function are expressed in a form of model block diagram and ladder diagram by utilizing MATLAB／Simulink／Stateflow and MC Ladder. Then they are loaded into the target while utilizing Real-Time Workshop and MC Ladder as automatic-coding tools.By utilizing AD-VirtualConsole, user interface can be easily developed by arranging control components on the screen in your desired position. A series of application works can be performed without tedious coding work.　Legacy applications can be linked with new applications via COM interface very effectively.