The significant challenges that urban design faces when moving forward into this new digital era involve the increasingly massive and complex projects that must be analyzed and developed. The need for efficient analysis tools and rational design methods represent ongoing concerns, while practicable and maneuverable applications rather than experimental studies are scarce. This research implemented a framework of digital description and generative grammar of block form from the perspective of block morphological complexity. The implemented framework was tested in an urban design practice. First, this study adapted the hierarchical structure and access structure theory to analyze the spatial form of target blocks. The characteristics of blocks case samples in Nanjing are extracted as text descriptions. Second, the relevant composition patterns and parameters were employed as features for classification and were converted into procedural rules. With the top-down control by rules and bottom-up generation by shape grammar in CityEngine, the texture of the block can be generated as close to the actual block as possible. Furthermore, in a real urban design case located in Nanjing, this work applies the method to construct a three-dimensional scene quickly and accurately. After integrating design factors such as an environment, transportation, and vision and summarizing the intentions of blocks and buildings in corresponding functions and control indexes, the initial generation plan was built by applying the obtained characteristics and procedural rules in specific shape grammar. Finally, designers can adjust the result in detail by employing real-time calculation and interactive operation.

在进入新的数字时代时，城市设计面临的重大挑战包括必须分析和开发的日益庞大和复杂的项目。对有效分析工具和合理设计方法的需求一直是人们关注的焦点，但缺乏实用和可操作的应用程序，而不是实验研究。本研究从块形态复杂性的角度实现了数字描述和块形式生成语法的框架。实施的框架已在城市设计实践中进行了测试。首先，本研究采用分层结构和访问结构理论来分析目标块的空间形式。提取南京地区典型案例样本的特征作为文字描述。第二，相关的组成模式和参数被用作分类的特征，并转换为程序规则。通过CityEngine中的规则自上而下控制和形状语法自下而上生成，可以生成尽可能接近实际块的纹理。此外，在南京的一个实际城市设计案例中，这项工作应用了该方法来快速，准确地构建三维场景。在综合了环境，交通和视觉等设计因素并在相应的功能和控制指标中总结了街区和建筑物的意图之后，通过将获得的特征和程序规则应用于特定的形状语法来构建初始生成计划。最后，