Since the terror attack of 9-11, international terrorism has become the focus of International Relations research. This paper attempts to study the content of international terrorism through four aspects: structure, strategy, instrument, and funding. Through the discussion on the structure of international terrorism, including the parties involved, motives, and operations, this paper extends to analyze the strategy and instrumentations of terrorism, and the mode of gathering and flows of funding. What this paper hopes to achieve is to help us gain a deeper insight on international terrorism.