An oscillator model was set up to study on microfriction between the contact surfaces.The friction between two atomic of NiTi shapememory alloys was calculated using oscillator model,and the friction force of NiTi shapememory alloys at the martensite phase and austenite phase was measured through atomic force microscope (AFM).Results show that,at nanoscale,friction is greatly influenced by load and surface physical property,such as elastic modulus,Poisson’s modulus,and lattice constant.The friction coefficient of martensite phase is lower than that of austenite phase.Theoretical analysis and experimental results are consistent,which confirms that the atomic scale friction force calculation using oscillator model conforms to the actual situation.