The purpose of this study is to investigate the findings dealing with therapeutic factors in group counseling/therapy and to present the directions of future study in group art therapy. Through reviewing literature on therapeutic factors in group counseling and therapy, except inpatient groups, one of the striking observations is the three main streams of general research tendencies. The most potential therapeutic factors for any particular group vary as a function of the group being studied, the stages of group development being sampled, or the characteristics of group member. Even though the importance of therapeutic factors is varying with the level of group function, interpersonal learning, self-understanding(insight), catharsis, and cohesion are highly emphasized in outpatient groups and self-growth groups. These factors are common factors in group counseling and therapy. A literature on stages of group development supports Yalom's hypothesis that therapeutic factor is differently valued as group development, but shows the inconsistent results. Recently, there is a growing tendancy that the perception on particular therapeutic factor is a function of different participants within group. Based on above observations of therapeutic factors, Future directions for group art therapy are discussed. Key Words : Group Art Therapy, Therapeutic Factor, Group Counseling/Therapy, Group Development Stage.