The uniaxial tensile tests of 7050 aluminum alloy were performed at 0.01～10 s^-1 and 423～623 K by Gleeble1500 thermo-simulator combining with finite element method（FEM）.The parameters of flow stress,dynamic recrystallization and thermo-plastic damage were determined firstly by experiment and FE uniaxial tensile tests.Furthermore,the effects of stress triaxiality on the thermo-plastic forming damage of 7050 aluminum alloy under different temperatures were investigated via the FE analysis for different notched bars based on the Bridgman method.Lastly,the DEFORM-3D software was adopted to analyze the process of grain size growth of the 7050 aluminum alloy under the different stress triaxiality.The results indicate that at the same temperature,the plastic damage value is increased with the increase of the stress triaxiality degree,while the damage value remains stable when the stress triaxiality is more than 0.7.At the same stress triaxiality,the plastic damage value is decreased with the increase of the temperature,while the damage value remains stable when the temperature reaches to 523 K and the grain size of 7050 aluminum alloy is decreased with the increase of stress triaxiality ranged between 0.33～0.50,and the grain size is increased with the increase of stress triaxiality ranged between 0.5～0.9.