Under the background of transforming the mode of economic growth and promoting green development in an all-round way，the role of tourism in regional green development is also undergoing fundamental changes. During the construction of Zhejiang Big Garden Construction，the role orientation of tourism and its positive impact on promotingreallocation of production factors，expanding the path of industrial development，optimizing the regional spatial structure and changing the mode of production and life provide an analysis case for innovating tourism development，recognizing the impact of tourism on the region，and triggering thorough thinking about the mechanism of promoting regional green development. The article points out that establishment of scientific evaluation mechanism for tourism，innovation of co-construction and sharing mechanism and improvement of policy implementation evaluation mechanism are the main directions for future breakthroughs.