Abstract: The World Trade Organization (WTO) is growing by its membership and its impact on the international life is increasing. The links between WTO law and regulations in non-trade areas take more and more place in international system. Its effect in protection of human rights and environment is worth mentioning as important factor of the international legal order. Harmonization of national laws according to WTO provisions and the way it is done seems to be a move to priority of international law in national legal systems. The conclusion of the research is that the WTO law encounters a number of problems which are common for different spheres of international regulation and it may be helpful in overcoming them correlating with general principles and other rules of international law.