Abstract: The online examination system was designed based on Struts using JSP with three-tier，including database，database connecting pool，login on module， choosing question module and test module. The problems of current examination system such as the account existing at the same time，the user keyboard misuse，the flexibility for setting questions were summarized. The solution obtaining modified server-side scrpting， database relationships and client-side scripting was proposed.

Key words: Struts, database, database connecting pool, online examination system