Abstract: Experimental study of 1.54 THz laser imaging and transmission property were studied by using a CW THz waveguide discharge-pumped high-power DCN laser system operating on 1.54 THz. A real-time, continuous-wave terahertz imaging is demonstrated with the 1.54 THz laser and a simple two-dimension scanning system. The position and shape of a plastic sign card and a metal coin hidden in an envelop are easily identified through just measuring the transmission intensity of the THz laser. Absorption coefficients of a few samples were also measured with the 1.54 THz laser system. The 1.54 THz laser transmission property of these samples was reported in detail.