Since the existing international legal regime governing space weapons is inadequate, the international community is worried about the weaponization of outer space. This paper introduces the efforts and contributions in this regard made by the UN General Assembly, the Conference on Disarmament, the UN Committee for Peaceful Uses of Outer Space and the UN Institute for Disarmament Research. It then analyzes several different approaches to solving the problem of weaponization of outer space, i.e. amendment of Article IV of the Outer Space Treaty, conclusion of a multilateral treaty on comprehensive prohibition of space weapons, and transparency and confidence-building measures in outer space activities. It concludes that a multilateral treaty on the prevention of weaponization of outer space with appropriate verification mechanism will be a final solution. At the present stage, a combination of various CBMs can also serve the purpose to prevent space weapons.