Abstract: Aiming at the problems of the sensitiveness to pose changing and mesh simplification in current zero watermarking algorithms,a zero watermarking algorithm for 3D mesh models based on shape diameter function is presented.Firstly,an ordered vertex set is generated by calculating the value of shape diameter function for every vertex.Then,a robust vertex distribution sequence is generated by using the ratio of every vertex neighboring area to the minimum vertex neighboring area.Finally,the zero watermarking sequence is constructed by the vertex distribution.Experimental results show that the proposed algorithm can not only resist a variety of common attacks including translating,rotating,uniform scaling,noise adding,mesh subdivision,mesh simplification and mesh cropping,but also resist the attack of pose changing in a certain extent.