The purpose of this study is to investigate the mediating effect of emotional intelligence and countertransference management ability in the relationship between novice counselor’s adult attachment and working alliance. Adult attachment measurement methodologies take the view that it is more appropriate to conceptualize adult attachment types as dimensions rather than being composed of separate categories, and studies which suggest that the path to interpersonal relationships may vary depending on attachment anxiety and attachment avoidance dimensions are being conducted. Accordingly, adult attachment was divided into attachment anxiety and attachment avoidance dimensions, and the path that each dimension reaches the working alliance was examined. 215 novice counselors participated in a questionnaire survey. The results are as follows; First, attachment anxiety and attachment avoidance had negative effect on working alliance. Second, emotional intelligence and countertransference management ability had dual mediation effect in the relationship between attachment avoidance and working alliance, but they did not have dual mediation effect in the relationship between attachment anxiety and working alliance. These results mean that the pathways that attachment anxiety and attachment avoidance affect working alliance are different, which suggests that factors to be dealt with may vary depending on the attachment dimensions in the growth of novice counselors as professional counselors. The limitations of the study and future directions are discussed.