Play therapy techniques are utilized to demonstrate social skill improvement of preschool children, the purpose of the study inspects the effectiveness of group play therapy to improve social skills among children. Method: Search done from pub-MED, EBSCO, Delnet, Google Scholar, etc. using key word such as effectiveness of play therapy on improving social skill among preschool children. Those were focused between the period of from 2011- 2016 of which around 30 published articles were investigated regarding effectiveness of play therapy on improving social skill of pre-school children, from these article 8 article were selected. Result: play therapy reduced the quantity of violence, fear, anxiety in children to a great level. An assessment of the result of pre-test and post- test indicate a significant difference, group play therapy and even the type of plaything enhance the social skill of children. Conclusion: this article is accomplished that considering the achievements.