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The pseudo-elasticity of equiatomic NiTi shape memory alloy nano-pillar subjected to a uniaxial compression-unloading was investigated via molecular dynamics simulation.By analyzing local atomic structure and system temperature,our work focused on the nucleate sites and the path of phase transformation at atomic scale.It was indicated that the nucleation sites and propagation paths of reverse transformation during the unloading were different from that obtained in the loading(i.e.,compression)process.In the loading process involving the B19 phase,the NiTi shape memory alloy nano-pillar absorbed the heat from the environment and then the temperature decreased.The temperature of unloading process exhibited the opposite trend to the loading one.