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A THz reflection imaging system is demonstrated based on a 124×124 pyroelectric array camera and a CO2 pumped continuous-wave (CW) THz laser. Self-made resolution charts were employed to test the imaging resolution. Real-time imaging experiments were carried out to test the system's imaging property. Experimental results demonstrate that clear THz images of objects could be produced and the profiles could be resolved by averaging 5 frames' images. And when 30 frames of images are averaged, the resolution could reach up to 0.6mm.