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The present situation of paperless examination system is introduced, this paper aims at the character of poor commonality for most of paperless examination system, a paperless examination system based on WEB has been designed, the management mode and examination mode of this system will be separated by the network frame of B/S. The design of database system uses the universal management mode of the database of curriculum and the database of examination information to realize its commonality. The adaptive learning technology of difficulty coefficient of examination questions is presented in order to making the system have high efficiency of assembling test paper in this paper. What's more, different display orders of examination questions for those neighboring students through a new algorithm already are realized, this measure can prevent examination cheats effectively, and fairness of each examination can be guaranteed. At the same time, this system have also resolved these problems such as that replacing machine and the second login because of other reasons and so on, these will ensure the security of examination. The technologies of automatic paper rating technology and automatic outputting report of examination results to Excel sheet etc. are used in order to realize functional requirements of the examination system such as automation, security and high efficiency of this system.