With the development and application of TiNi shape memory alloy, its mechanical properties attract more and more attentions. In order to study the mechanical properties of TiNi alloy, the static tensile stress-strain curves of TiNi alloy under different temperatures has been obtained by using MTS universal testing machine, based on which a detailed analysis was performed. The split Hopkinson pressure bar(SHPB) has been used to get the corresponding stress-strain curves of TiNi alloy under a variety of high strain rates. The improved SHPB system was used to get the dynamic fracture toughness of TiNi alloy by carring out dynamic three-poin bending test. The results showed that the deformation behavior of TiNi alloy was different from those of the general metals.There were two yield platforms, two elastic stages and two non-elastic deformation stages on both static and dynamic stress-strain curves of TiNi alloy. Meanwhile, TiNi alloy was a relatively brittle metal and more easy to be brritle fracture under dynamic impact loading.