Historical and cultural blocks in Chinese historic districts are important components of sustainable heritage tourism. In towns along the Grand Canal, historical and cultural blocks are generally integrated with modern commerce, forming a complex space characterized by multi-elements, multi-cultures, and multi-functions. The understanding of tourists' spatial cognition thus becomes extremely important to support heritage conservation and encourage sustainable heritage tourism. This study proposes a space syntax-based methodology to help inform heritage consultants and urban designers in understanding the tourists' spatial cognition of canal town cultural blocks, and thereby assists designers and managers in identifying where cognitive experiences can be improved. The proposed method is applied to Nanyang, which is a canal town currently in decline in Shandong Province, and is contrasted with the ancient town of Wuzhen in Zhejiang Province, China, a highly successful tourist town. By using this proposed method, the relationship between street networks and tourists' spatial cognition has been explored. The results of the analysis were evaluated in order to inform a range of design concepts that could enhance the sustainable heritage tourism experience of these two towns.2 of 18 using space syntax to analyze Chinese historical districts rarely considered tourists' perceptions of spatial configuration.This research aims to develop a space syntax-based analysis method that combines environmental psychology and space syntax. The method applies linear mathematical analysis methods in spatial syntax, which is a default built into Depthmap [3] analysis software, to calculate a series of parameters to generate an axis map, and then to select the main variables in the space syntax model by analyzing variables, including the connectivity value, control value, mean depth value, global integration value, local integration value, and intelligibility value. The correlation between the value and spatial information are reported in several recent studies [4][5][6][7]. If a space has high connectivity value, it means a large number of spaces connect with this space [4]. Control value could reflect spatial connectivity [5]. Furthermore, the mean depth value refers to the shortest topological distance of the space from all other spaces. The higher the integration value, the higher the accessibility and commonality of the space [6]. Intelligibility value is used to measure whether the local spatial structure helps to establish an understanding of the entire inter-spatial system, and indicates spatial identifiability [7]. Based on the definitions of main variables and spatial cognition of environmental psychology [8], tourist spatial cognition indicators can be developed.This proposed method is explored through a case study of Nanyang, in China, in which tourists' spatial cognition is analyzed, in order to develop a range of urban design options to support sustainable heritage tourism. The following paper is divided into five distinct ...