Aiming to address the problems encountered in the conventional green tea fixation and shaping process, including restricted tea-leaf movement and uneven heat distribution caused by low heat-transfer efficiency and structural limitations of traditional troughs, which often lead to local scorching, incomplete fixation, loose strip formation, and dull leaf color, a high-temperature, high-frequency fixation and shaping machine equipped with a specially shaped trough was developed. The movement behavior and force characteristics of tea leaves at different processing stages within the high-frequency reciprocating specially shaped trough under high-temperature hot-air heating conditions were investigated to identify the key factors affecting fixation and shaping performance. Based on the design objectives, the operating parameter ranges were determined through theoretical analysis and calculations, with the reciprocating frequency of the trough ranging of 4.66~6.00 Hz, the shaping angled from 40° to 50°, and the hot-air temperature ranged from 300℃ to 360℃. A discrete element simulation model of the fixation and shaping process was established by using Rocky DEM to determine the optimal combination of operating parameters. Based on the simulation results, a three-factor, three-level orthogonal experiment was conducted by using a prototype machine, with strip formation rate and broken tea rate selected as evaluation indices. The mathematical models of the key parameters were optimized by using Design-Expert 13. The results showed that the optimal operating parameter combination consisted of a reciprocating frequency of 5.34 Hz, a shaping angle of 46.2°, and a hot-air temperature of 329.2℃, under which the strip formation rate reached 90.91% and the broken tea rate was 1.22%. Validation experiments conducted under the optimized conditions yielded a strip formation rate of 88.96% and a broken tea rate of 1.27%, with relative errors of less than 5% compared with the predicted values, demonstrating the high reliability and accuracy of the optimization results. The research result can provide a theoretical basis and technical reference for the design and optimization of fixation and shaping machines for premium green tea production.