为实现逆向工程中点云区域的自动分割,利用自组织竞争人工神经网络(SOM),对基于散乱点云的自由曲面信息计算方法进行改进,并基于自由曲面信息构造了一个八维SOM神经网的输入向量,利用SOM神经网络实现了逆向工程中区域自动分割.实验验证了本文算法的有效性. In order to realize the automatic segmentation of the point cloud area in reverse engineering, an algorithm of self-organization competitive artificial neural network (SOM) was used to improve the method of computing free-form surface information based on scattered point cloud. Based on the free-form surface information, an eight-dimensional SOM neural network The input vector of SOM neural network is used to realize the automatic segmentation in the area of ​​reverse engineering.The experiments verify the effectiveness of the proposed algorithm.