Abstract: In orthodontics,we often use the wax models are often used to simulate the movement of teeth in jaw bone. In order to further investigate the orthodontic force system and the ways of teeth moving in the wax models,as well asthe relationship between the displacement and the orthodontic force,the resistance properties of teeth in the wax models is crucial,which will be the base of orthodontic treatment planning and clinical operation. First,through a thermodynamic experiment,the motion resistance range was measured on a copper bar for simulating a tooth in the wax models under different temperature; and then,setting the appropriate temperature similar to oral cavity,the wax model resistance experiment platform was designed and built. During the experiment,the copper bar motion displacement and the time past in the wax models were recorded by a ruler and a camera respectively; and then the relation curve between the copper displacement and the time under different movement modes were fit. According to the force balance theory of rigid body,the tooth movement in the wax models of viscous resistance was calcuated,and the relationship between resistance and velocity was figured out. The research results will provide the theoretical supporting for further studying on the teeth mobile displacement and the necessary orthodontic force system in the wax models.