Abstract: Two kinds of specimens are designed: coupler with plain concrete and coupler with steel reinforced concrete. Then experimental research on detection of coupler grouting compactness was conducted by industrial X-CT. The results indicated that it was feasible to use industrial X-CT to detect coupler grouting compactness, and both the grouting area and the non-grouting area could be distinguished clearly; industrial X-CT can overcome the influence of concrete, steel bar and the outer wall of coupler, under complex cases such as longitudinal reinforcement and stirrup block, coupler location change, double coupler layout, the internal grouting state of all couplers can be displayed effectively, and further more the tiny pores within both concrete outside coupler and paste inside coupler can also be shown clearly, which indicated that industrial X-CT had the strong ability for nondestructive testing. This study makes rapid detection of coupler grouting compactness in lab become true, and also provides basis for the development of adaptive field testing method..