The Purpose of the study was to investigate the relationships among codependency, intimacy competency, and intimacy. The sample consisted of 425 college students who have had fallen in love and is falling in love from14 universities in Taiwan (140 males, 244 females). Instruments used in this study included Codependency Assessment Scale, Intimacy Competency Scale and Intimacy Scale. Data obtained in this study were analyzed by MANOVA, ANOVA by adjusting a and Canonical Correlation Analysis. The main findings were as follows: 1.Gender differences on Codependency, Intimacy Competency and Intimacy.2. The canonical correlation between college students´ codependency and their intimacy competency showed that when the students had more codependency, they had higher competency in initiation and lower competency in emotional support and negative assertion.3. The canonical correlation between college students’ codependency and their intimacy showed that when the students had more codependency they had lower intellectual intimacy and recreational intimacy.4. The canonical correlation between college students’ codependency, intimacy competency and intimacy showed that when the students had more codependency and lower intimacy competency in initiation, negative assertion, disclosure, emotional support and conflict management, they have lower emotional intimacy, intellectual intimacy, social intimacy, recreational intimacy, bodily intimacy, and spiritual intimacy. Finally, implication of the study of guidance for establishing intimate relationships and future research were proposed.