Objective: This study was carried out to compare the personality traits and defense mechanisms in Addicts group and healthy subjects. Method: In This descriptive study by cluster method in access. 100 addicted and 100 nonaddicted people were selected. Used questionnaires to assess defense mechanisms are (DSQ40) and NEO. https://www.roneverhart.com/Phi-Mu-Mom-Dad-Embroidered-Button/