Since the 1970s, the International Political Economy (IPE)has explored various research methodologies and methods. However, the disciplinary boundary of IPE is still controversial. The main purpose of this article is to discuss the British School of IPE from three dimensions. First, why is this school called 'British?' Are there differences between the British School and the English School of international relations? Secondly, British School scholars prefer to call this new discipline the' Global Political Economy (GPE)'instead of 'International Political Economy.' Thus, what is the underlying meaning of 'Global?' Does it require the use of different research methodology? Thirdly, the British School is often viewed as the 'Critical International Political Economy (Critical IPE)'. What does 'Critical' represent here? What are the differences and similarities of the Critical IPE and the Critical Theory of International Relations? The author hopes that the discussion of these three dimensions could help us further understand the British School of IPE.