The feasibility study of this project and the method and process of structured system analysis are introduced in succession . the primary content of requirement investigation and the function requirements are presented . partial operations in this field are described using operation flow diagram and the process of disassembling and analysis of this system is described using layered dfd ( data flow diagram ) 首先简要介绍了技术方案的选择和项目的可行性研究；接着简要介绍了结构化分析法的方法步骤，介绍了本项目需求调查的主要内容，并用业务流图对应用领域的部分业务进行了描述；用分层数据流图描述了对系统的分解和分析过程，较详细地描述了系统的功能需求。
