The purpose of this study was to explore mediating effects of interpersonal competence, gratitude disposition between childcare teachers positive psychological capital and happiness. The subjects of the study were a total 231 Childcare in Seoul. The statistics program used to achieve the purpose was SPSS/PC+18.0. The statistics methods applied were pearson correlation coefficient, simple linear regression, and multiple linear regression. The major results of this study were summarized as follows: First, Positive psychological capital and interpersonal competence, and gratitude disposition from happiness was found to be positively correlated. Second, interpersonal competence had an affect on childcare teachers happiness. These effects are mediated in part by the control interpersonal competence showed. Third, gratitude disposition affects childcare teachers happiness. These effects are mediated in part by the gratitude disposition showed. These results suggest that dispositional gratitude and cognitive flexibility play an important role in the development of happiness for childcare teachers.