The purpose of this research is to clarify the relationships between college students’ coping styles and their feelings for friends, and between coping styles and coping appraisal during their interpersonal friendship events. Initially, feelings for friends and coping appraisal were considered as variables in the process until coping affected mental health. Later, the differences between their feelings for friends and coping appraisal were explored by their choice of coping style. The results of cluster analysis of coping styles during interpersonal stress were divided into four groups. The variance analysis of coping styles and feelings for friends showed that the group using many positive relationship-oriented coping styles （e.g., “I tried to actively participate with the other party”） had higher “confidence/stability” feelings than did the other groups. The group with low use of negative relationship-oriented coping styles （e.g., “I tried to ignore the other party”） showed high “anxiety/concern” feelings, while the “rival” feeling was low in the group with lower use of positive relationship-oriented coping styles. The results of the variance analysis of coping styles and coping appraisal showed that the groups using positive relationship-oriented and postponed-solution coping styles （e.g., “I tried not to care about the other party”） more highly appreciated the efficacy of using these coping styles than did the other groups.