Abstract: Aiming at the existing of the joint surfaces in the CNC Heavy-dutygantry machine,a new method exactly creating the spring-dumping element of the joints by using joint nodes is presented.By using the finite theory,a mechanical system is divided into two typesof part,Bodies,Joints.Each part has its modeling.Continuous bodies are compartmentalized by using finite method.And the joint surfaces are divided into element and nodes.The joint nodes carry symmetrical characteristics.In the modeling of the joints,the new element that is created by the node and the corresponding node of six degrees of freedom embodies the relationship of the node among the tension,compression and torsion.The CNC Heavy-dutygantry machine model can be built by combining the elements and nodes of the joints and the bodies.In order to validate the imperative of modeling the joints and the effectiveness of the new method,a general CNC heavy-dutygantry with and without the characteristics of the joints are built by using the HYPERMESH and ANSYS software,meantime,the emulated data of the modal analysis and the experimental data are contrasted.