The purpose of this study was to assess the effect of a health education for 5th Grade students in Taipei City, by using a set of projectiles named "Facing Menstruation Healthily". All of the eleven 5th Grade classes from some elementary school in Taipei City were selected. Six of them were assigned to an experimental group at random, and the others, a control group. Three days after a pre-test the experimental group attented two forty-minute classes, but the control group didn't. A week after the intervention, a post-test was also given to all of them. The conclusions indicated: (1) After the intervention, the experimental group's score of the menstruation knowledge was higher than that of the control group. The experimental group's attitude toward menstruation was also more postive than that of the control group. (2) More than 90% of the students indicated that the menstruation educatio nwas helpful to themselve. (3) 97.2% of the educators approved the propriety and the sufficient of the educational materials. This teaching materials and methods could be recommended to the educational departments for giving a trial at school.