Purpose: The purpose of this study was to compare the degree of health behavior, body composition and body image in college women by BMI. Method: The subjects consisted of 291 students classifying three groups (underweight, normal weight, overweight). The data were collected by a structured questionnaire and bioelectrical impedence analysis from October, 2003 to April, 2004. The collected data were analyzed by SPSS program including descriptive statistics, x$^2$-test, ANOVA, Scheffe test and Pearson Correlation Coefficient. Result: There were statistically significant differences according to food preference and overeating in dietary behavior, and according to regularity, frequency, necessity, main reason of doing exercise and item in exercise habit of health behavior. And there were statistically significant differences according to body composition and body image among three groups. Body image indicated a significantly negative correlation to BMI, body fat mass and percent body fat mass. Conclusion: It is necessary to develop supportive program for decreasing a risk of bad health and for increasing self-esteem in college students and to perform individual approach according to their physical and psychological health states.