Terahertz(THz) imaging has shown wide application prospects in many fields such as human body security inspection, non-destructive inspection, quality monitoring, biomedicine, and semiconductor characterization. In this article, various two-dimensional THz imaging techniques are reviewed, including scanning imaging, single-pixel imaging, electro-optic modulation imaging, direct imaging with THz camera, and so on. The research backgrounds of various imaging technologies are summarized, the specific imaging methods and imaging results are analyzed. The advantages and disadvantages of different terahertz imaging technologies are concluded, and the future development trends of terahertz imaging technologies are forecasted.