Abstract: Energy level intervals, QED contributions and transition probabilities of magnetic dipole (M1) and electronic dipole (E1) for 1s²3s²S_1/2→1s²2s²S_1/2,and 1s²2p²P_1/2→1s²2s²S_1/2 transitions are calculated for the Li-like ions (Z=3~100) using the fully relativistic multiconfiguration Dirac-Fock method with Breit and QED correction. Comparisons between the M1 and E1 transitions are made.

Key words: magnetic dipole, electronic dipole, Li-like ion, transition probability