Abstract: SBand standing wave elec tron linacs have got wideranging application for industry nondestructive testing and formed varied kinds of products. Xband electron linac for NDT has been developed by Schonberg Company USA in 1985. Because of bigger structure of S-band linac and difficult machining of XBand linac, an Cband portable linac for NDT has be developed in CIAE at pre sent, a whole sealed vacuum accelerating tuber will be given here. It consists of 4 cavities, the pha se velocity of the first two cavities is 0.5 and 0.9, respectively, and that of the second two cavities is 1. The high power testing proved that the design of the accelerating tuber is good for 1.5MeV electron linac for NDT.