Abstract: The aim of the present research was to investigate the effect of life style changes on marital adjustment. Eighty couples who had the most determined maladjustment were selected and randomly divided to experimental and control groups. Then an intervention method for life style change was administered to the experimental group. The Enrich was questionnaire for pre and post test. The results show that, the method of life style changing was reducing marital maladjustment. The marital adjustment change score between two groups (Experimental and Control) was significantly different (p<0.001). This effect was for dimensions of marital adjustment such as; personality issues, financial management, conflict resolution and sexual relationships. It was recommended that counselors and psychotherapists select their intervention method according to the maladjustment dimensions to help afflicted couples with maladjustment.