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We study various particle–hole excitations and possible superconducting pairings mediated by these fl uctuations in dopedα-RuCl3 by using multi-band Hubbard model with all t2g orbitals. By performing a random-phase-approximation (RPA) analysis, we find that among all particle–hole excitations, the jeff=1/2 pseudospin fl uctuations are dominant, sug-gesting the robustness of jeff=1/2 picture even in the doped systems. We also find that the most favorable superconducting state has a d-wave pairing symmetry.