The segmentation of 3D human body is the most crucial technology for digital fashion, digital body measurement, computer animation and other applications, but the current segmentation is not very accurate. For the shortcomings of head segmentation, the segmentation of 3D head based on point cloud data is studied. The method of maximum distance and the method of approximate edge of convex hull are proposed to locate the feature points and the cut section. An oblique angle of cut section is introduced to segment head. The experimental results show that the proposed method improves the real time and accuracy of head segmentation.