The thesis analyzes concerned hidden trouble of network security , common used method of network attack , the system structure of information system , hierarchy of network security , security evaluation rule of information system , and analyzes the problem of e - business which shall be solved 本文分析了網絡本身存在的安全隱患,常見的網絡攻擊方法,信息系統的安全體系結構,網絡安全的層次模型,信息系統的安全評估準則,在此基礎上分析了電子商務要解決的難題。