The purpose of this research, which conducted by descriptive-correlation methodology with members of production cooperatives of out of season products at Kermanshah province of Iran, is to study the role of social capital management on success and development of production cooperatives. The statistical samples consisted of 220 persons; who have been selected on random sampling basis, and studied by questionnaire. The validity of questionnaire conducted by panel of experts and its reliability calculated by Cronbach's alpha coefficient and resulted 0.83. Data were analyzed by SPSS software. The results showed that the rate of the following factors effect success of production cooperatives: individual motivation 97%, members active participation 96.4%, cooperation spirit among members 93.6%, goodwill among cooperative members 92.4%, willingness for upgrading occupational know-how 91%, attention for upgrading quality of products 90.2%, relation with other cooperative societies 89.6%, using experiences of other cooperative societies 88.4%, disposal of own experiences to other cooperative societies 87.8%, awareness about global markets 87%, attention for development new products 86.8%, concern for community and interaction with society 86.2%, mutual trust among cooperative members 85%, common image of future among members 84.4%. Therefore, it is recommended that enhancement of effective factors of social capital management should be taken in to account for the purpose of increase in success and development of cooperatives more than ever.