This study has examined defense styles in Iranian samples with psychometric properties Defens Style Questionaaire (DSQ-40). 1067 subjects are (666 high school students, age mean: 16.61 SD: 1.13 and 401 university students, age mean: 21.3, SD: 3.8, 527 female, 540 male) that participated in this investigation. Internal consistency, concurrent validity, content validity, test-retest and cronbach a in Defense Style Questionaaire for Iraninan sample were computed. Results showed appears the DSQ-40 to be a reliable (a=/81-/87) and valid instrument (Its properties concerning content validity, concurrent validity and construct validity) for Iraninan sample.