This study was done to provide basic data to develop smoking prevention and non-smoking education program. Questionnaire were collected from 438 male, 474 female middle school students at Chunchon, Kwangwon-do from Sep 2, 2000 to Feb 28, 2001. The Questionnaire used to measure subjects' knowledge and attitude about smoking was Guideline for the content of tobacco smoking surveys of the general population by WHO. The collected data were analyzed by SPSS-Win program. The results were as follows. 1.The average score of knowledge about smoking of subjects was 57.01 on the basis of 100. 2. The average score of attitude about smoking of subjects was 63.54 on the basis of 100. 3. In knowledge about smoking, there were statistically significant difference according to subjects' grade(F=3.218, p=.041), thinking about smoking behavior(F=3.424, p=.017), harmfulness of smoking(F=17.202, p=.000), present drinking(F=3.555, p=.029) and in attitude about smoking, there were statisti cally significant difference according to subjects' grade(F=20.520, p=.000), sex(t= -5.073, p=.000), mother's smoking(t= -2.405, p=.035), brother's smoking(t= -5.022, p=.000), mother's schooling(F= 3.730, p=.024), having smoking friend or not (t=-9.357, p=.000), subjects' smoking experience (t=-12.363, p=.000), present smoking(F= 76.643, p=.000), quantity of smoking(F= 6.808, p=.001), period of stop smoking(F= 4.685, p=.004), beginning time of smoking (F=2.286, p=.049), thinking about smoking behavior(F=17.933, p=.000), harmfulness of smoking(F=58.360, p=.000), present drinking (F=58.071, p=.000). 4. There were significant relationship between subjects' knowledge and attitude about smoking(r=.469, p=.000).