The acquisition speed and spatial resolution are the key factors in application-oriented terahertz (THz) imaging systems. To solve this problem, the techniques of the THz synthetic aperture radar (SAR) imaging, THz interferometric imaging and THz compress sensing (CS) imaging have been proposed by scholars based on SAR, electromagnetic interference and CS. All of them have a good potential in imaging speed and spatial resolution. We review these techniques and summarize the technical advantages and recent research progress. The prospect of applications of THz imaging techniques in the fields of military, public safety and non-destructive defect identification is given.