This article is aimed to explain meaning and spirit of war in Islam, mainly concerning war ethic, protection for war victim and after war regulation. Lslam considers war as collective obligation, for the purpose of self-defence to maintain souvereignity. It is only permit for the war between Moslem and Non-moslem, which is diferent from internasional hunianitarian law, which classified  war into international arm conflict and Non-international arm conflict. Therefore, in lslam war is on expection for self-defence purpose.