Piezoelectric stack actuators are widely used for driving intelligent deformation devices.Piezoelectricstacks have small displacement outputs, which can be increased using amplification structures.To this end, an ellipticaldisplacement amplification structure was designed in this study, and the effect of structural parameters on theperformance of displacement amplification structure was analyzed. The structural parameters include the major axisof the ellipse, thickness of the shell, displacement in the X direction, and width of the piezoelectric stack. The performancefactors include displacement output, stress intensity, and amplification factor in the Y direction. The sampleswere fabricated based on the optimization results, and an amplification factor of approximately 5.3 was achieved.The transient response of the amplification structure driven by the high-frequency voltage was analyzed,and the influence of the frequency of driving signal on the displacement output was simulated.The results showedthat the displacement output of the structure did not exhibit distortion driven by a alternating voltage with a periodof 0.01 s