系统分析是应用系统思想和方法，把复杂的对象分解成简单的组成部分，找出这些部分的基本属性和彼此之间的关系，系统分析也是根据系统调查中获得的原始资料，对用户组织内部整体管理状况和信息处理规程进行分析，确定用户需求，并建立新系统的逻辑模型的过程。系统分析和设计是系统信息系统开发的核心，而系统分析又是系统设计的基础。它是研制信息最重要的阶段，也是最困难的阶段。其具有决策性，方向性，策略性的特点。-System is the application of systems thinking and methods, the complex object decomposition into simple components, to identify these part of the basic attributes and the relationships between them. systems analysis is based on surveys of the original information was, right user organizations within the overall management of information processing and analysis of a point of order to determine customer demand. the establishment of a new system and the logic of the process model. Analysis and design of information systems at the core system development, system analysis and system design is based. It is the development of information most important stage is the most difficult stage. Its decision-making, direction, the strategic characteristics.