The Grand Canal has been built for more than 2 500 years. It inherits the long history and civilization of the Chinese nation and carries rich heritage resources. It is the historical treasure of China. However, for a long time, under the impact of the development of modern urbanization, the Grand Canal is also facing great pressure on heritage protection, low quality of inheritance and utilization, difficult situation of resources and environment, serious occupation of ecological space and other difficulties, and the heritage value has been gradually eliminated. Based on the heritage corridor theory, taking Suzhou, the only city along the grand canal that applies to the world heritage with the concept of “ancient city” as an example, this paper analyzes the heritage resource points and the urban spatial environment from the two aspects of the spatial distribution characteristics and suitability of the Grand Canal heritage, to provide an important basis for the Grand Canal heritage protection and planning. It also has practical guiding significance for heritage protection planning, linear corridor construction, urban style construction, and other contents carried out in various regions.