The research examines the role of market expansion and international labor division in the British Industrial Revolution from the perspective of globalization. The research shows that British cotton textile output in pieces grew 275 times from the 1770s to the mid-1850s and documents that such growth would never have happened without a vast overseas market for the supply of raw cotton and the sale of products. The paper argues that the continuous and dramatic expansion of overseas markets allowed the British cotton industry to expand greatly without hitting the ceiling of marginal returns, leading not only to the great expansion of production, but also to technological and institutional innovations, and that international labor division made it possible for the industry to import ample amounts of raw cotton and export large amounts of cotton textiles. In contrast, foreign demand for Chinese cotton textiles increased significantly in the late 18th and early 19th centuries, but accounted for only 0.3% of production capacity, which was too little to lift the law of diminishing marginal returns and to induce either technological or institutional changes. As a result, only Smithian growths could be achieved through optimal resource utilization and specialization in production.