Considering the characteristics of the actual spinning of Ti₂AlNb alloy, a three-dimensional elastic-plastic FE (finite element) model of power spinning of thin-walled Ti₂AlNb alloy shell was established based on the dynamic, explicit module of FE software. Stress concentration and the inhomogeneous deformation during simulation was dealt with reasonably. The process parameters were optimized and the distribution of strss and strain of workpiece with different passes were studied based on this model. Results showed that stressconcentration is found with increase of passes, meanwhile strain increases. This will lead to the deformation of workpiece is inhomogeneous. To solve this problem, stress-relief annealing between pass and pass was adopted. The reliability of model was validated by comparing the results of simulation and actual production.