This research conducted self-report questionnaires from 86 of both play therapists and children who were participating in child psychotherapy treatment at the institutions located in Seoul and Gyeonggi Province in order to investigate how play therapists’relationship and professional experiences impact to the child's therapeutic relationships. The standards applied for this research are the examinations of relationship and professional experiences restructured by Bum-Hee Ahn(1985), and therapeutic relationship between children and play therapist from the therapeutic relationship standard (Kronmüeller, Hartmann, Reck, Victor, Horn, & Winkelmann, 2003; Shirk & Saiz, 1992) adapted and validated by Eun-Ryung Bang and Myung-Sun Choi(2004) The results are summarized as follow: First, It shows that the more sympathetic-accommodative and social-favorable tendencies the play therapists have, the more positive emotions the therapists feel with children in therapeutic relationships. Also, the more defiant, and mistrust tendencies the therapists have, the more negative emotional relationships the therapists feel. Second, if the play therapists have more experiences, total sessions, and supervision numbers, the therapists appear to feel higher therapeutic cooperative relationship with children. Third, if the play therapists have lower dominant-superior and competitive-aggressive characters, the children influence the positive emotional relationships into their play therapists but if the therapists are dominant-superior, competitive-aggressive, and conspicuous-intoxicated, the children influence the negative emotional relationships into their play therapists. In therapeutic relationship by the personal characters of therapist, there is a correlation in therapeutic cooperative relation based on the total number of sessions and personal training analysis of play therapist. Therefore, it is able to say professional characters and experiences of play therapist impacts a lot to therapeutic relationship of play therapy with children and this result implies that gaining a lot of experience and training in clinical trial is more important than anything.