The purpose of this study has considered practicality, reliability, validity and norm finding of Rao‘s social maturity test among a sample group of 500 high school female students of Tehran. The sample was selected by no random method and they answered the questionnaires. The questionnaire was used in this study is made of 90 questions. The reliability coefficient of Cronbach‘s Alpha was equal to 0.833 In order to determine inventory validity the oblique analysis was used. Results showed that 10 factors determine 29.115 of the whole variance of variables. These factors are as follows: 1- lack of self, 2-domination, 3- trust in others, 4- laches, 5- Timidity, 6- Variety-seeking, 7- Interest of Justice and Selfishness and 8- Benevolence, 9- Carefree, 10- Grandiosity. The scale was correlated with the social adjustment test. Correlation of social adjustment and social maturity of questionnaires that contains 90 questions was calculated on a sample of 72 students. Results showed that 5 factors: 1 (Lack of self), 2 (Domination), 4 (Laches), 5 (Timidity), 7 (Interest of justice and selfishness) with social adjustment test (CPI) has correlation and correlation coefficient of Rao ‘s social maturity test with social adjustment test is 0.411.