Due to the characteristics of civil engineering structure customization requirements,the application of current parametric design approaches is confined and inefficient at programming.Therefore a 2D parametric design software,ParaCAD,finds out another approach.It adopts a platform development pattern by taking customized parametric structure as its center to realize the separation of the definition system and the application system,hence forming a parametric ecological system which is promoted by the tripartite cooperation of developers,definer and users.Furthermore by the combination and innovation of such fundamental technologies as efficient parametric formula relation,conven-ient visual editing operation and free-of-side-effect definition process model,ParaCAD effectively improves the efficiency for parametric struc-ture definition.So far a lot of work has done on parametric structure definition and implementation upon the platform.The target of basic cov-erage by related specific structures is reached.Meanwhile in practical engineering projects the published structures are populated and applied to design graphs,which have obtained good application achievements.%由于市政工程设计的行业特点，导致现有参数化设计手段应用范围受限、编程开发效率低下。为此二维参数化设计软件ParaCAD 另辟蹊径，采用以自定义参数化构筑物为中心的平台化开发应用模式，实现定义系统和使用系统的分离，形成开发人员、定义人员和使用人员三方互相合作促进的参数化生态体系。ParaCAD 还通过高效的参数化公式联动、简便的可视化编辑操作和无副作用的定义过程模型等关键技术组合创新，有效地提高了参数化构筑物的定义效率。在该平台上已进行了大量参数化构筑物的定义实施工作，达到了相关专业构筑物基本覆盖的目标，同时在实际工程项目中推广使用已发布构筑物进行设计出图，取得了很好的应用成效。
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