Rare earth (RE)–transition metal (TM) ferrimagnet is receving of great interest 1, because the unique coupling of RE and TM moments enables the antiferromagnetic spin dynamics 2. Since magnetic moments of RE material originates primarily from the 4f-electrons which locates far below the Fermi level while that of TM arises from the 3d-electrons near the Fermi level 3, magnetic moment configuration at different energy levels should be studied more carefully. However, such energy-level dependent approaches have largely been ignored in spintronic researches. Here we present the experimental evidences for the energy-level-dependent distinct magnetic moment configuration in ferrimagnetic TbCo alloys. Four different approaches such as Hall measurement, VSM measurement, TR-MOKE measurement, THz emission measurement, were used to study the magnetic moment at different energy levels. We found that the magnetic moments at deeper energy level are rather easily altered by the external magnetic field than those at Fermi level, suggesting that the magnetic moment responds differently depending on the energy level. Further investigation on the temperature dependence shows that the Tb moment exhibits the spin glass-like freezing possibly induced by the random anisotropy of Tb. Our results reveal the important energy-level dependent characteristics of RE-TM ferrimagnets and therefore pave the way towards a better understanding of antiferromagnetic spin dynamics in RE-TM ferrimagnets