In today’s world,almost all of the antitrust law is not only applicable to conduct within its territory,but also to conduct outside the territory if such conduct eliminates or has a restrictive effect on competition in the domestic market. However,there are cases involving international cartels in recent year that indicated that it is also not good,if the scope of the extraterritorial application of antimonopoly law expanded too far,because in that case there will be jurisdictional and legal conflicts between related countries,and additionally it is also not reasonable for the companies. It is well established in the world that antimonopoly law shall not apply extraterritorially unless such conduct has a direct,substantial,and reasonably foreseeable effect within the domestic market. China has handled some international cartel cases and demonstrated that China has accepted this principle. However,due to the fact that international trade and commerce is complex and China has become the important market for the multinational companies doing business,China should clear its basic principle for the extraterritorial application of its antimonopoly law in order to increase the transparency and predictability of the Antimonopoly Law enforcement.