The purpose of this paper is to identify and classify the main factors implementing the cloud manufacturing systems in the internet service providers company by fuzzy cognitive map methodology. Through expert opinions, 20 main factors were identified and classified based on the importance and then a fuzzy cognitive map approach was applied for obtaining the relationship between the factors, and all of the impact factors are outputs of expert opinion. The outcomes of the study highlighted that three factors, including customer scoring, R&D, and method development were the most important factors impressing the implementation cloud manufacturing systems. Present practices for implementation cloud manufacturing system is and the relationship between the main factors also impressing cloud manufacturing system by employing the fuzzy cognitive map approach in the Iranian internet service provider company. The model obtained in this study guides the managers to identify and classify the important factors of the cloud manufacturing and finally implement it successfully.