Purpose: The purposes of this study were to identify the relationships among perceived parental bonding, illness perception, and anxiety and todetermine the influences of perceived parental bonding and illness perception on anxiety in adult patients with congenital heart diseases. Methods:In this study a descriptive correlational design with survey method was utilized. The participants were 143 adult patients with congenitalheart disease being cared for in the cardiology out-patient clinic of A medical center. Data were collected using the Parental Bonding Instrument,Illness Perception Questionnaire Revised Scale, and Cardiac Anxiety Questionnaire Scale. Data were analyzed using descriptive statistics,independent t-test, one-way ANOVA, Pearson correlation analysis, and hierarchial regression analyses. Results: There showed significant positiverelationships of anxiety with maternal overprotection, consequences, and personal control respectively. Among predictors, maternal overprotection(b=.45), consequence (b=.26), and personal control (b=-.03) had statistically significant influence on anxiety. Conclusion: Nursing interventionsto decrease maternal overprotection and negative consequence, and to enhance personal control are essential to decrease the anxiety ofadult patients with congenital heart diseases.