Abstract: Urban tourism is one of the most important contents of tourism research. Urban agglomeration is becoming a basic unit which is playing a significant role in global economic competition, but the research on urban agglomeration tourism is in the initial stage. This article, by using the literature analysis method, firstly summarizes the main research content of urban tourism and urban agglomeration tourism. Then it analyzes the research trend path from urban tourism to urban agglomeration tourism. Finally the influencing factors of urban agglomeration tourism research are discussed. The results show that, tourism promotes urban development in six aspects, which are the development of urban trade district and urban waterfront space, economic increase and employment growth, supplement to urban planning, the improvement of the city image, and guiding or accelerating the improvement of the urban environmental quality. The synergy development between tourism and city emphasizes the characteristics of mutual benefits and dynamic trends. Urban agglomeration tourism drives the industrial cluster of tourism in urban agglomeration, improves traffic condition, optimizes the tourism spatial structure, and facilitates tourism cooperation among cities. Globalization and localization trend are the important power to urban agglomeration tourism formation, and urban system is the material basis of spatial construction. Diverse and different demands for tourism products and markets is the thrust. Represented by communication among cities, the fast traffic belongs to science and technology support. And the government plays a leading and coordinative part in urban agglomeration tourism development. All these five factors have driven the change from urban tourism to urban agglomeration tourism. Urban agglomeration tourism emphasizes dynamic mutual effects under the regulation and control of government and market from multitude systems and elements in the hands of different subject interests. Urban agglomeration tourism research is at the deepening stage based on the research of urban tourism. Against the background of transformation and upgrading strategies in Chinese tourism, the city is the frontier battlefield of the development of the tourism industry. There are different influencing factors in different urban development stages, different development evolution mechanism in different functions and types of urban tourism. Urban agglomeration is becoming a vital force for cities to participate in regional competition. Tourism would provide a good stimulation effect in the element and the whole construction for city and urban agglomeration. Research on the content of urban tourism and urban agglomeration. Systematic research can be conducted to lay the foundation for future research and broaden the scope of tourism geography.

Key words: deepening research, urban agglomeration tourism, urban tourism