Solid models only provide low-level geometry information of products and do not have high-level feature information.As a result,it is very difficult to modify the solid model.It is necessary to reconstruct design features from the solid model and transform a solid model to a feature model.The cutting loop can be identified by a cutting loop search algorithm and then the relation graph of cutting loop is built.According to the relation graph,design feature can be identified and the feature model can be built.Finally,a reconstruction example is provided,which demonstrates the effectiveness of the presented method.