High-temperature tensile tests were performed on TA15 titanium alloy at strain rates of 0.001 s^–1, 0.005 s^–1, 0.01 s^–1 and temperatures of 880 ℃, 900 ℃, 920 ℃, 940 ℃. The material exhibits excellent superplasticity with elongation exceeding 500% above 920 ℃ and below 0.005 s^–1. The constitutive equations of TA15 titanium alloy and the strain sensitivity index m and material constant K values at different temperatures with strain rate of 0.005 s^–1 were calculated. Finite element simulations were used to analyze the thickness distribution of the double-layered structural component, and pressure–time curves were obtained. At the temperature of 920 ℃, the hollow double layer structural parts with local weight reduction are made by using pre-hollow panels SPF/DB, the minimum wall thickness is 0.31 mm, the diffusion area of the component was analyzed by ultrasonic C-scan, and the results showed that the bonding ratio is higher than 95%.