The purpose of this study was to identify and assess influential social adjustment factors in children who live in child care institutions. To do this, correlation and regression analysis in Structural Equation Model were carried out on 326 children from 12 child care institutions. The findings are as follows; Social adjustment in children living in child care institutions were deemed better based on higher self-esteem, more maintenance of contact with parents, more positive caring environment within institutions, higher support of fellow school children, and more pro-social charactes of school peers. The influence of each variables on social adjustment was indicated to be highest in institutions with a caring environment. In conclusion, self-esteem, pro-social charactes of school peers, support of fellow school children, and contact with parents (in that order) were deemed most influential to social adjustment.