The main purpose of this research is to develop a way for identification of informal leaders in the organizations by Dematel technique. For this purpose, firstly the components of social influence of informal leaders in the organizations have been identified based on the review of the related literature. Using the idea of masters and pundits in psychology, management, and exploitation of Analytic Hierarchy Process (AHP), we identified the local weight of social influence criterions of informal leaders. Finally, by calculating inconsistency rate, the reliability of criterions' pairwise comparisons was approved. After this stage, a questionnaire was prepared to calculate the measure of social influence of spastic sample and was delivered to participants. By the use of scores obtained from questionnaire and Dematel technique, participants ranked on the basis of the highest social influence.