The study is to show the change of sex role identity of cadets and their attitudes toward women over the four year sex-integrated education at the Korea Air Force Academy. Longitudinal method and cross-sectional method are adopted to carry out this study during the period of 1997 -2001. In longitudinal research, 13 female cadets and 88 male cadets from the class of 1997 are participated in 1997, 1999 and 2001 years. For the comparison of the result of longitudinal research, 17 female cadets and 183 male cadets from the class of 2001 joined in cross sectional research. The results are as follows. The cadets have more masculine identity than feminine identity and this trend is more visible in senior years than in junior years. Female cadets show more progress attitude in general women' role than male cadets. In attitudes of women as manager and military women, female cadets' attitude more progressive than male cadets in first grade, but this trend is decreased in the end of second grade and it recovered in fourth grade. The results are discussed in the present state of sex- integrated education and tasks of it.