Objectives: The treatment program for batterers of domestic violence has been provided since 2001 in Taiwan. We explored and analyzed the phenomenon and process of this unfamiliar and challenging male batterers' group. Methods: The cognitive-oriented group program was run 90 minutes each session, weekly for 18 sessions. Each group was led by one male and one female therapist. The type of group was close, and emotional sharing and support were encouraged. The whole course of group was videotaped and recorded by the observer. And then these materials were provided for content review and process analysis. Subjects: There were 24 male batterers attended our treatment program in 4 groups. All of them were referred from the court for mandatory treatment. Three of them dropped out from the groups. The drop out rate was 12.5%. The average age of group clients was 44.04 years. Results: The following 5 key items were regarded as the most important issues in the 4 groups. From the points of these 5 items, the varieties of group picture and the evolution of the process could be delineated well. The 5 key items were: Denial and resistance: Not surprisingly, a common characteristic of the group members was the denial and minimization of their violence toward family members. Against social norms and authority: The groups were served as a form of judicial punishment, thus lowering member's initial trust, interest, and attraction to the group. Cohesion and effectiveness: The premature form of cohesion was repetitively emerged in the beginning of group therapy. We had to go through this particular stage and move to more mature and cohesive stage. Role of therapists: The group leaders worked hard in bringing out and bridging members' feelings toward others, especially in the initial period. As the group progressed, the role of the therapists was changing. Emotional disclosure: To ignore the batterer's life or emotional problems may strengthen their defensiveness. The batterer's emotional disclosure in the group was highly correlated with the positive development of group process.