the main purpose of the present research is to investigate on generations gap among Lamerd Guidance School Student and their parents. statistical society is 1630 students of lamerd guidance school and via kocran formula 310 student was selected as sample .information and data was collected by questionnaire.Results shows that having not enough perception of parents to their children and vice versa, precise supervision access of children to multimedia, special condition of society, modernism, improvement in education is one of the main factors to generation gap.The second important points was changing in values, for examples for boys and girls, political, religion, social, economical, cultural, is values in contrast for their parents religion values is in top and for their fathers political, social, economical, cultural is accepted value and for their mothers social, political, economical, cultural is their values.