In this research, after an in-depth study of the exiting literature and experts’ judgments and views, the important criteria and measures for PROJECT manager’s communication have been identified and prioritized via AHP technique. In order to have a more exact consideration of the research, the model has been improved by DEMATEL technique. This reviewed analytic hierarchical process methodology provides the validity that meets the model’s claim. The effective criteria prioritized in this communication model using DEMATEL technique consist of conceptual skills, decision making skills, management skills, leadership skills, respect of ethical values, individual & team work skills, conversation skills, and writing skills. The findings of this research could play a pivotal role in increasing the awareness of the Iranian organizations’ managers, particularly PROJECT managers, towards accomplishing these criteria and improving the necessary skills according to the importance and priorities of these criteria.