This paper presents a method of dynamic connection of adjacent closed sections and a retrieval method based on spherical feature. Connect the closed sections by the position relationship and the proportion of the original model

merge the original model into one closed section

split the model according to the geodesic distance function value of each point

get the skeleton point from each section

and get the connected skeleton after removing the redundant points. Use the skeleton point of minimum geodesic distance function value as the center of the sphere

build some spherical surfaces on the skeleton

get the characteristics of the spherical intersection used for retrieval. The experimental results show that the method can extract the skeleton effectively and improve the retrieval precision.