This study describes the laboratory program in Occupational Medicine and its improvement by the medical student s evaluation and need survey at the Department of Preventive Medicine, College of Medicine, Ewha Womans University. In November 1995, the questionnaires consisted with 2 groups and 10 items about each of 5 subjects were administered to 85 medical students. The contents of 10 items were composed of evaluation of method, contents, operation method, space, tools and handouts, time and their satisfaction of the laboratory work. The program was designed in the aspect of small group discussion followed by presentation of laboratory their results. Some important outcome of their evaluation about laboratory works were as follows; 1) Most of the students felt that the laboratory work was progressed by the proposal(76.0%) and the appropriate handout(63.0%) and recent contents(73.5%). And the feedback of report and homework was appropriate(87.3%). 2) They wanted to do small group discussion about some subject, especially case problem solving, determination of health examination and to present their results. 3) They satisfied with the content of experiment especially case problem solving and observation of the video(related to occupational accident and disease) and the method of presented and small group discussion. 4) But they complained the excessive amount of laboratory hours and time for which their desire directed Foward a proper amount for the time. A plan to induce and control the small group discussion by the subjects and self-learning program is made in next semester.