提出一种使用功能属性（functional attribute，FA）及有向交互标签（directional interaction tag，DIT），对基于系统思维的过程分析（system-theoretic process analysis，STPA）方法所涉及的层次化控制结构模型（hierarchical control structure model，HCSM）进行拓展与改进的方法。通过该方法构建层次化功能控制结构及交互模型（hierarchical functional control structure and interaction model，HFCSIM），达成对STPA的实质性提升与完善。通过这一改进，STPA中HCSM的构建没有严谨而具体方法和形式，以及组件间交互信息不完整且过于依赖“头脑风暴”和难以保障模型一致性等问题得以解决，并从根本上确保了分析结果的系统性、完整性和正确性。最后以飞机机轮刹车系统为例，验证了该改进方法的有效性。

A method of expanding and improving the hierarchical control structure model （HCSM） of system-theoretic process analysis （STPA） using functional attribute（FA）and directional interaction tag （DIT） was proposed. Based on this method， the hierarchical functional control structure and interaction model （HFCSIM） of the system and essential improvement to STPA was obtained. Through this modification， issues such as the lack of specific methods and forms follow， incomplete interaction information between components， excessive reliance on “Brainstorming” and the difficulty in ensuring model consistency could be solved， and the systematicness， completeness and correctness of the analysis results could be fundamentally ensured. Finally， the effectiveness of the modified method was validated by taking the aircraft wheel braking system as an example.