Abstract: In spaceborne imaging spectrometry,the most basic andcrucial problem is information acquisition.This paper points out four keyproblems on the information acquisition technology,and emphaticallyanalyses the spectrum and radiation calibration techniques of spaceborneimaging spectrometer.Meanwhile the information transmission techniques ofspaceborne imaging spectrometry,such as overcoming satellite-to-groundtransmitting data crowding etc.,are also described.