System Dynamics Model follow the procedure for ¡§data collecting ¡÷ model design ¡÷ analysis ¡÷ modification¡¨ to analyze problems on a project by project base; however, this process is just a principle report and it cannot directly and continuously affect business decision. Furthermore, after the completion of each project, data often is locked in the file room and cannot be reused. If simulation tools of System Dynamics allow user to connect the dynamics data source from the enterprise, potential benefits will be: 1. After analysis, with business data, model can be simulated time after time. This enable the repeating use of previous investment. 2. Decision makers can simulated condition of the future use the enterprise online data . The main purpose of this research at probe interaction of System Dynamics Model and data source. Under above-mentioned structure. In the phase, we propose to add a ¡§Data Source¡¨ component in traditional structure of the System Dynamics model. The new component will connected model and data source, and keep the independent executed of the model. And in addition to the design of the structure of the model, this research also according to the structure, design physical simulation tools ¡V we call the tool Maria. Maria can provide the function of building and simulating System Dynamics model like the traditional simulate tool, and connect model and dynamic data source. We use a simple model to prove the value of System Dynamics model and data source, and the future prospect of the structure.