Space syntax can be an angle to study the space form scientifically. Space form can be abstracted as the objective data to express the relationship between the space and human behaviors. Taking Taigu ancient city as an example, the authors aim to analyze the street space form using Depth map software, based on literature data and survey data. By choosing the map of Ming and Qing dynasties and the map of status quo as the research objects, the street space form in ancient city was abstracted into an axis model and a line model. The eigenvalues of integration, intelligibility, selectivity and entropy were obtained for describing the characteristics of space form. According to different space forms, the corresponding landscape design methods were adopted. Comparing the spatial eigenvalues of the two periods, the method of space syntax was introduced into the study of the space form development mechanism, which could provide reference to ancient city protection and develop the landscape design for Taigu ancient city.%空间句法可以将空间形态抽象为客观量化的数据，表达空间与人的行为之间的关系，提供科学的空间形态研究角度。通过空间句法的应用，以文献资料和调研资料为依据，利用Depth map软件对太谷古城空间进行研究。选取明清时期和现今2个时期太谷古城地图为研究对象，详细分析古城道路系统抽象成的轴线模型和线段模型，得到古城的整合度、可理解度、选择度、熵值等特征值，针对不同的空间形态采用相应的景观设计手法。在2个时期古城空间形态特征值对比研究的过程中，总结古城空间的形态发展变化，提出客观地对待现有特征，利用现有资源使古城空间形态与现代发展相适应，并对太谷古城的景观设计提出思考。
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