The aim of this study is investigation cognitive and metacognitive theories and recent researches  about obsessive - compulsive disorder (OCD). Salkovskis believes that critical cognitive component in OCD is inflated responsibility that a person has for her/him intrusive thoughts, this responsibility was caused naturalization behavior. In Rachman theory metacognitive bias such as thought- action fusion (TAF) has more important role. This bias increase responsibility and guilt. Also, this bias could increase compulsion for decreas those feeling. In Wells metacognitive theory is emphasized to metacognitive believes for example; lake of cognitive confidence, TAF, thought-event fusion and thought- object fusion. According to Clark cognitive thought control theory, existence some vulnerabilities such as anxiety trait, negative mood and metacognitive believes with interaction negative mood and events cause intrusive thoughts and unsuccessful try to control them intensify these thoughts. In sum, according to Obsessive Compulsive Cognitions Working Group (OCCWG) six cardinal cognitive pathology of OCD include: inflated responsibility, overestimation of threat and liklihood, TAF , overimportance  and control thoughts, perfectionism and intolerance of uncertainty, that in this article the relation of these factors and their relation with  OCD symptoms was studied.