Solid refrigeration technology based on the elastocaloric effect has a great potential altative to the conventional vapor compression cooling.Here we report the large elastocaloric effect in Ti-Ni (50 at％) shape memory alloy below its austenite finish temperature Af under different strain.Both Maxwell’s and Clausius-Clapeyron equations are used to estimate the entropy change.The strain-induced entropy change increases with raising the strain and gets a maximum value at a few kelvins below Af.The maximum entropy changes ASmax are-20.44 and-53.70 J/kg.K,respectively for 1％ and 2％ strain changes.Large entropy change may be obtained down to 20 K below Af.The temperature of the maximum entropy change remains unchanged before the plastic deformation appears but moves towards low temperature when the plastic deformation happens.