Inorder to improve the performance of Fourier Transform Infrared Spectrometer, the optical structure was based on the combination of cube corner mirror and fixed plane mirror, a swing mechanism moving mirror scanning system was designed. The system transfer function was established and the characteristics of control model was analysised, a feedback algorithm was designed to fit the system. It indicates that the system was friction free and insensitive to vibration; the optical structure can compensate the tilt and shift caused by the swing of the moving mirror, ensure the repeatabilty and stability of instrument; the algorithm parameters was adjusted to improve scanning accuracy, and the precision is better than 98.4%. The SNR of spectral is better than 80000: 1 by using the system, under 4 cm－1,which can meet the requirements of high precision quantitative analysis.