It needs to understand the system in depth before the modeler establishes models, and it also requires much time to establish models.These are the buttleneck of the application in System Dynamics.

• 在建立系统动力学模型之前，建模者必须对系统进行深入的了解，而且建立模型所花费的时间也颇长，这些都造成系统动力学应用上的瓶颈。