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Enterprise Resource Planning systems (ERP) are pre engineered packages designed for internal information processing and facilitating integration of the information of the firms and fast responding to the customers. Implementation of these systems is always time consuming and expensive and all parts of the organization will be challenged with the implementation process. Evidence indicates that despite the excessive time and cost, unfortunately most firms haven't implemented these systems successfully and others which climes success, have some problems with after implementation. For protecting the organizations against the risks and dangers of ERP, it is necessary that managers arrange an investigation for organizational readiness assessment before ERP implementation. In this study we tried to extract factors for organizational readiness assessment. 18 criteria extracted from literature and these factors analyzed by Factor analysis and summarized to 5 factors and the most important criterion had been Specified this research is very useful for those company which wants to implement ERP system