This study  aimed  at  investing types and degree of social deviation a many 12-18 years old students of Sari city in academic year 1394-95. the data for the study comes from 384 students, selected by the use of stratified sampling, factor analysis is utilized to classify around 50 Likert-type questions related to different areas of social deviation, to identify main types of deviations, t-tests& Anova are used to examine the existence of meaningful differences a many students subgroups .Finding  show that 5 types of deviations are experienced by the students, including drug addiction(5.5%),vandalism(8.3%)cultural deviations(9.6%)new-formed deviations(14.5%), and nature deviations(15.6%).