The terahertz spectra of four stealthy cloths including gray shielding cloth,brick-red shielding cloth,light and dark calibration shielding cloth were studied experimentally,the shielding effect is discussed.Results show that these four shielding cloths have a good shielding effect to terahertz radiation;especially the gray shielding cloths has a better effect,it will bring difficulty for terahertz detection,if they are applied on aerospace or military equipments.