Although there is no concrete restrictions on the legality of using space weapons,many international legal instruments including UN Charter all attempt to fufill the non-militarization of outer space.

The reform of the United Nations also relates to the collective security system and the modification of the Charter of the United Nations.

The Idea of Harmonious World and the Essence of UN Charter;

The use of armed force by the aliens without being authorized by the Security Council is not only an aggression against Iraq s sovereignty, independence and territorial integrity, but also a violation of both UN Charter and international law.

Collective security system set by UN Charter,compared with the stipulations of League of Nations,has made far reaching progress.

According to the North Atlantic Treaty,NATO is not a regional organization which the United Nations Charter has referred to.

Economic sanctions imposed by the Security Council are a link of enforcement actions empowered by the United Nations Charter Chapter V11.

Under the UN Charter, there are three kinds for regional organization to use force.

Classic humanity interference practice and theory had been formed in the modern international law,after the UN Charter the theory was negated and excluded,among the Western scholars there exists the view of legitimate humanity interference which are an excuse and instrument for the western countries in violating sovereignty and interfering domestic affairs of other countries.