Internet has greatly influenced on the medical education and exchange of biomedical information. Furthermore, this technology is now widely used in the evaluation of medical students and gives rise great interest on the CAT (computer aided testing). In this report, we adopted one of network technology (CGI; common gateway interface) to the evaluation of medical students. Students are supposed to click the radio button to answer the questions and if they click the 'submit' button, then the examination is finished. Student evaluation and item analysis was designed to perform in the internet browser just after termination of examination of all students. The most important merit of this evaluation method is supposed to be the multimedia items used in the examination. Vivid color pictures seen in the monitors were proved to be the key component for the objective evaluation and perfection of the examination items. Although this method is not supposed to be the perfect method at this time, we believe that continuous efforts for the improvement of remained technical problems will make this method one of the most useful and effective evaluation tools.