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With the acceleration of the process of economic globalization and information synchronization, every major event is accompanied by the simultaneous renewal of the city. In the era of urban development, the launch of major events is also for the renewal and development of the city. 2016 Rio Summer Olympics and 2010 Shanghai World Expo are taken as the research objects. Through the analysis of urban renewal from the perspective of the role of big event catalyst, it is verified that the big event catalyst has a positive impact on urban renewal, transportation, industrial transformation and other aspects. Moreover, it tries to combine the theory of urban catalyst to analyze its inspiration for the Beijing Winter Olympic Games, hoping to play a catalytic role in accelerating the urban renewal and transformation of Beijing and the reorganization of urban structure. [ABSTRACT FROM AUTHOR]