[[abstract]]The quasi-experimental method was used in this study to explore the effects of health education intervention program to breast self examination (BSE) among women above 20 year-old. Four night schools in Chin-chuang, Taipei county were selected on purpose, and assigned to experimental group(I), experimental group(II) and control group. There were 123 subjects who completed pre-test and post-test questionnaire. 110 subjects finished the follow-up 4 months after intervention. The obtained data were analyzed by chi-square, t-test, ANCOVA and logistic regression with SPSS 9.0 for windows. The major results were as follow: 1. On baseline, 50.4% of the subjects had ever performed BSE, only 6.5% did it regularly (once a month). Knowledge and self-efficacy were quite low. Only 20% reach the BSE skill criteria. 2. "BSE education class" can improve knowledge, self-efficacy, BSE skill, BSE rate and intention of the experimental group subjects. "Booklet" can improve self-efficacy and BSE rate of the control group subjects. 3. In post-test, the subjects of experimental group had significantly better improvement in knowledge, BSE skill, BSE intention than control group. 4. "Postcard reminder: experimental group(I)" had significantly better improvement in regularly performing BSE rate and intention than experimental group(II) and control group . According to the findings of the study, some recommendation for BSE education program was brought up: BSE education class accompanied with skill practice has great effect. After class, postcard should be sent to remind women performing BSE regularly.