Abstract: To investigate the effect of satellite vibration on dispersive push-broom imaging spectrometer, on the basis of its optical principle and operational process, the in-orbit dynamic spectral imaging model of the spectrometer was established. By the aid of decomposing imaging process, the mapping relation between imaging spectrum of spectrometer and satellite attitude vibration could be found. Also the weight coefficients of all spectrums doping in mixed spectrum were obtained. The simulation results show that, caused by satellite vibration, the weight coefficient of original spectrum doping in mixed spectrum would reduce to less than 0.2, which implies the spectral aliasing is very serious.