方法：用流率基本入树建模法构建系统流图，用VENSIM软件进行模拟分析和干预。
Methods: Using the SD model to build the SD diagram and using VENSIM to do stimulation analysis and intervention.
流率基本入树建模法不仅实现了规范化建模，而且有利于反馈环的计算和反馈性分析清晰化。
SD rate variable fundamental in-tree modeling not only realizes standardization of modeling but also is beneficial to calculation of feedback loops and perspicuity of feedback analysis.
流率基本入树建模法不仅实现了规范化建模，而且有利于反馈环的计算和反馈性分析清晰化。
SD rate variable fundamental in-tree modeling not only realizes standardization of modeling but also is beneficial to calculation of feedback loops and perspicuity of feedback analysis.
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