With the development of technology, computers have been frenquently used as be a testing tool in different tests.There are some On-line Testing Systems can be used. It has discussed the feature of existing On-line Testing Systems. The strongpoint of On-line Testing System based on Client/Server is stated. Structure and function of On-line Testing System based on Client/Server architecture has been presented. Some ideas have been proposed and adopted to resolve main problems.%随着科学技术的发展，越来越多的考试采用计算机作为测试工具，也出现了众多的联机考试系统．本文讨论了目前常见的联机考试系统的特点，阐述了基于C/S结构的联机考试系统的优点，详细介绍了基于C/S结构的的多线程联机考试系统的结构、功能，并就出现的主要问题提出了新的解决方法．
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