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The relativistic isotope shiRs[1]of the few-electron atomic systems including He Ⅰ,Li Ⅰ,Be H,Be Ⅰ and C Ⅱ are calculated using the multi-configuration Dirac-Hartree-Fock (MCDHF) method and the relativistic configuration interaction (RCI) approach[2-4].Isotope shifts of these light dements are significant because the isotope shift could be used to test the fundamental quantum theoretical description at high accuracy;furthermore,the extraction ofnuclear charge radii fiom isotope shift became possible by combininghigh-accuracy measurement with atomic theory.