Based on multi-configuration Dirac-Fock method, radiative recombination （RR） process of H-like uranium ion and radiative decay process of the resultant ion have been studied systematically using the recently developed program RERR06, which is based on GRASP92 and RATIP packages. In the studies, the RR cross sections from 1s state of H-like uranium ion to 1snl （1≤n≤8, 0≤l≤6） of He-like uranium ion have been calculated in detail. Meanwhile, the relative intensity of the radiative decay spectra of the RR final states have also been studied. It was found that the RR cross sections to different orbitals decrease with the increasing of principal quantum number. Furthermore, an important contribution of the radiative decay of the RR final states to the relative intensity of Kα spectra has also been found in the present work.