Inthisarticle,twoterahertztransmissionimagingsystemsarebuiltwitha2.52THzcontinuouswavelaserandtwotypesofsensors.Oneisarrayscanningsystemusinga124124pyro-electricarraycameraasthedetector;theotherisapoint-wisescanningsystemutilizingaGolaycellasthedetector.Theimagingspeedandqualityisbrieflyanalyzed.Terahertz(THz)imagingresultsdemonstratethatthearrayscanningsystemhashigherimagingspeedwithlowerresolution.Thepoint-wisescanningsystemhashigherimagingqualitywithlowerspeed.