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The elastocaloric effect of PbTiO3 thin films with 180° domain structure is studied using the phase field method.The influence of exteal stress σ33,misfit strain um and domain wall energy on the adiabatic temperature change (△Tσ) at room temperature are carried out.The calculation results indicate that |△Tσ| increases as |σ33| or |um| increases.The largest △Tσ value of-7.8K is obtained at σ33 =2 GPa and um=-0.02.Furthermore,the domain switching behaviors under different gradient coefficients are different,and finally affect the elastocaloric effect in PTO thin films.These results could provide a guide to choose the substrate and the preparation process in experiments.