Abstract: A basic multi-agent model centered on a virtual object controller is presented.The model effectively separates the global running process with the local one,separates the running of tasks with the coordination among them,and integrates the selection of tasks with recognizing states of the task itself and its environment as well.Thus the model can separate the system control at a high level with the running process at a low level.It can solve problems of consistency and generality in matching control structure between the virtual system and the real system,so that the virtual system structure can have more flexibility,expansibility and reusability.At last, some running examples,which are built by visual programming method,are illustrated to verify the system model given in the paper.