Abstract: Combined with the HUST-CAID system（computer aided industry design system developed by Harbin University of Science and Technology），this paper introduces the freeform feature，and gives the parameterized definition of freeform feature.On the basis of definition，the feature recognition is researched，the definition of freeform feature recognition is given，and then an algorithm for curve-based feature recognition is put forward.The algorithm formalizes a curve-based feature with a two-dimensional parameter，which the feature can be researched on two-dimensional plane.By using reconstructed feature of profile template library，it realizes curve-based feature recognition with template matching.

Key words: freeform feature, parametric description, feature recognition, curve-based feature

摘要： 结合自主开发的HUST-CAID（哈尔滨理工大学计算机辅助工业造型设计）系统的特点，引入自由曲面特征，给出了自由曲面特征的参数化定义，并在此基础上对自由曲面特征识别进行研究，先是给出自由曲面特征识别的定义，接着提出了基于曲线的特征识别的算法。该方法将基于曲线的特征以二维参数的形式给出定义，使其能在二维平面上研究，通过重构特征的剖面模板库，从而利用目标特征与模板特征匹配实现了特征识别。

关键词: 自由曲面特征, 参数化表示, 特征识别, 基于曲线特征