Abstract: In order to stabilize the suspension control of maglev train, a suspension gap disposal method that combines tracking differentiator with jointed filtering is proposed, in order to eliminate the signal distortion when suspension sensors pass through the track joints, and repress the adverse effect of random noise on the control accuracy. The tracking differentiator could reflect the actual generalized derivatives of signals with noise, and further filter the signals by using the generalized derivative characteristics of the threeway gap signal, featuring the advantages of small amount of calculation and easy implement. In this paper, the principle and characteristics of tracking differentiator with numerical simulation analysis are described. Finally, the feasibility and effectiveness of tracking differentiator in processing the suspension gap signal are proved by numerical simulation using tracking differentiator combined with measured data.