现代远程教育机考系统关键技术研究

With the development of Internet and database technology in recent years, modern distance education become universal, Using network technology for on-line examination becomes a necessary part of distance education,，various of online exam systems come into being. This paper analyses some difficulties of the existing examination, makes method to solve the key technologies of examination system: Making paper before exam, Staggering exam’s time and saving the answer document when the candidate commits answer reduce the simultaneous events and slow down the server’s pressure; using Ajax and cookie technology solves the accident which happen in the exam; designing the json format’s answer makes it available for all kinds of questions.