Objectives: This study was to develop a reliable and valid instrument measuring the reproductive health promoting behavior ofundergraduates. Methods: The initial questionnaires were made of 106 items from four domains through literature review. All questionnaireitems were revised by an expert group and a pilot test. Data were collected using the revised initial questionnaire of men’s 58 itemsand female’s 64 items from 634 male and 685 female undergraduate students. The collected questionnaires were analyzed by factor analysisusing varimax rotation to evaluate the construct validity. Results: According to the gender, two measurement were invented and analysedseparately. Four common factors consisting of 'safe sex', 'sexual responsibility', 'genital health management' and 'STD prevention' werediscovered in both groups. The 'genital hygiene' factor was added as a female factor. Male students' scale was made up 4 factors 16items and female students' scale was made up 5 factors 18 items. Cronbach's alpha for male scale was estimated to be .892 and femalescale to be .882. Conclusions: This scale will make it possible to measure the level of reproductive health among Korean universitystudents. This scale may be useful for developing effective methods of education as well as policy programs for improving the reproductivehealth of Korean university students.