中文摘要：

旅游是一项重要的城市功能，本文在对国内外有关城市旅游功能研究文献分析的基础上，提出大都市旅游功能应该从广义的范畴来定义，包括旅游目的地功能、旅游客源地功能和旅游中转地功能等3个方面的研究内容。本文以我国东部沿海三大都市密集区内的上海、北京、天津、广州和深圳为样本都市，运用主成分分析法对都市旅游功能进行测度，初步揭示了5个都市的旅游功能空间演变规律及内部旅游功能转型的趋势。本文尝试为大都市旅游功能强度和规模的比较、评估提供一种概念框架和分析范式，力争为地方旅游政策的制定和旅游投资措施的出台提供参考。

英文摘要：

Tourism is an important urban function. Based on the analysis of study literature about urban tourism functions both at home and abroad, the paper proposes that tourism functions of metropolis should be defined from the category of broad sense, including functions of tourist destinations, tourist generating areas and tourist transfer areas. The paper, taking Shanghai, Beijing, Tianjin, Guangzhou and Shenzhen located in the three metropolis cluster areas along China＇s eastern coastline as sample metropolex, initially reveals their spatial evolution regulation of tourism function and the trend of inner tourist function transformation, using principal component analysis. The paper attempts to provide a conceptual framework and analysis paradigm for the comparison and assessment of their tourism function strength and scales. It intends to provide references for the formulation of local tourism policy and adoption of tourism investment measures.