This paper, a novel improvement scheme based on Smith-predictor control is presented, aimed at addressing the time-delay issue in throttle servo control systems. Building upon Smith-predictor control, a PD control component is introduced into the scheme according to the research of Smith Gain Adaptive Compensation (GAC), enhancing the effectiveness of the scheme when theoretical time-delay parameters do not match actual ones. Additionally, a feedforward correction component is incorporated to suppress oscillations and overshoot resulting from mismatches in model parameters. Through comprehensive simulations, the effectiveness of our proposed improved Smith scheme is validated, highlighting its advantages over classic Smith-predictor in scenarios of model parameter mismatch. When there is a certain error between the time-delay parameters and the actual ones, simulation results demonstrate that the throttle output angle can track input commands with zero error, with an adjustment time of less than 0.3 s and overshoot consistently below 2%.