The purpose of this study, understand the relationship between family function and identity styles Female High School Students in Karaj. So, the statistic society of this research includes 300 girl students of second high school in 3rdr area of Karaj that were studying in year of 93-94 and selected by phasing clustering random sampling. In order to collecting information in this research about Berzonsky  identity  style inventory(ISI) and Bloom family functioning scale(FFS) has used. Present study results show that there is Positive significant relationship between family function and identity  style in this case, the results of regression analyzing distributed that 10 % students informational identity can being predicted and affected by family functions. Family functioning to predict informational style in three subscales, organizing, cultural trends and tendencies of taste and entertainment was significant.