This study deals with the competence of the securit council in the field of the maintenance of international peace and security, which are exercised either in conciliatory or repressive manner. The study shows that such competence is rather limited and must be compatible with the principles and aims of the United Nations.

Moreover, the study shows the excess or passive role of the Security Council in exercising its competence (a case study of Iraq) and demonstrates that the decision of the Security Council relating to the delegations of its power affects the sovereignty and territorial integrity of Iraq.

In addition, the American policy of power influenced the decisions of the Security Council in the Iraq –Kuwaiti conflict and led the council to take decisions, which are in contravention with the charter of the United Nations and international legitimacy.

Key words: security council , peace , competence , excess , deficiency , international legality , United Nations , decision , sovereignty.