Abstract: In order to process the irradiation test in the high gamma-ray flux region, a modular tube-type irradiation rig（MTIR） is developed. The MTIR is with the functions of adjusting and measuring, and can cool the test section in the high temperature and gamma-ray flux region. The verification tests prove that the MTIR can satisfy the irradiation test requirements, and efficiently uses the inner radiation holes of the High Flux Engineering Test Reactor（HFETR）, to shorten the radiation test period for the material, and improve the HFETER radiation capability.