In view of the traditional method of extracting skeleton process cumbersome, complex, the paper presents an interaction method of partial skeleton extraction for three－dimensional mesh model. Firstly, it extracts facets and vertexes for the partial of the three－dimensional mesh model; It makes the geometric cross－sections on the feature points and the aliquot angle; Then, the paper calculated the intersecting lines and skeleton points; It achieves the accurate extraction of a partial skeleton model and is simple. The paper presents some partial skeleton extraction instances, which is proved to be a method for the effective and the feasibility.