The software system is regarded as an organization or society in the requirements engineering processes. It is described,analyzed and modeled by ideology and abstract concept of histology and sociology. The theories and methods of social science are adopted in the requirements processes. The software system is decomposed of actors,roles,environment and organization. The key factors of system,in-cluding actors,roles,interactions,rules,goals and environment are decomposed of hierarchical subsystems from up to down based on the hierarchical organizational structure. The key factors of subsystems are mapped into concrete requirements activities. The functions of sub-systems are completed by the concrete requirements activities and tasks. Meanwhile,all subsystems and the concrete requirements tasks are aggregated as a global system organizational structure,and construct the whole system functions. It presents a new natural modeling meth-od and formal description framework for requirements engineering processes.%在需求工程过程中，引入组织学和社会学的思想和抽象概念，将软件系统视为一个组织或者社会，对软件系统进行描述、分析、建模。在需求过程中引入社会科学的理论、方法，将系统分解为成员、角色、环境、组织，用层次化的组织结构对系统的关键要素：成员、角色、交互、规则、目标、环境自上而下分解为层次子系统，将子系统关键要素映射为需求过程中具体的需求活动，用具体的需求活动及需求任务实现子系统功能，同时，对子系统及具体的需求任务进行聚集，得到系统全局组织结构，实现软件系统整体功能，为需求工程过程提出一种新的、自然的建模方法和形式描述框架。
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