Introduction: From yesterday till now, people helped to Iranian Red Crescent Society (former Red lion and sun society of Iran) in form of endowment. Endowment in opinion of absolute law was not desirable because it may cause many problems for Red Crescent society for examples: difficulty in changing the goals of endowment or continuation of authority and ownership of property dedicated. On the contrary, in opinion of legal realism and public law, endowment has superiority over settlement and donation, because of the control of endower continued until the end of endowed property. In fact, people supervision on government is accomplished in Red Crescent society. Also, other advantages of endowment are equal to settlement and donation. Finally, it should be said that endowment is better than settlement and donation in Red Crescent society in view of legal realism and public law.