A 3 D face region labeling algorithm based on square tangent plane descriptors is proposed. This new descriptor is obtained by encoding the geometric information in the square area on the surface of 3 D face mesh model.It is learnt by the least squares support vector machine（ LSSVM） algorithm to realize the classification of the vertex on 3 D face model

so as to identify and mark the eyebrows

eyes

nose

mouth and other regions.Simulation result can achieve a classification accuracy of 92.35 %.The proposed descriptor has rotation

head pose

3 D model resolution invariance and it has robustness to noise.Experimental results show that the proposed method can effectively mark the 3 D face model region.