the purpose of this study is determine hospital committees efficiency enhancing factors and members motivators for taking part in committees sessions, in selected hospitals,shiraz,iran,2015. The statistical population of this study includes 80 members of hospital committees in Shiraz hospitals. Type of study is applied and descriptive and analytic methods has been used to gain credible results. Researcher made questionnaire which was used for gathering needed data. Data were analyzed with the SPSS software and Friedman and gamma statistical tests were done. The results showed that among different committees efficiency enhancing factors, the most efficient factor on the base of samples point of view is discussed subjects should be related to the committees work profile, and the least efficient is, fallowing approvals implementation in each session. Also the most important motivator is presence of managers and the least motivator is session’s duration shortening. This study indicates ranking among committees efficiency enhancing factors and also among motivators for taking part in sessions .there is not any correlation between organizational and demographic characteristics and selected incentives and efficiency enhancer