Terahertz imaging is a technique which is under fast developing.In order to utilize it in nondestructive inspection,a novel THz imaging system,which based on continuous scanning system,is proposed.By experiment,the distinct images of different samples such as concealed coin or metal platelet with small holes are acquired.The result indicates that suspicious metal objects can be identified easily by this system.More important,the spatial resolution of this system is better than 0.5 mm.So we can draw a conclusion that THz imaging can be applied in nondestructive inspection successfully.