La2O2M2OSe2 (M=Fe, Co, Mn) are layered Mott-insulating antiferromagnets with a potential to be a non-copper high-Tc superconductor. All compounds have shown unusual magnetic properties related with strong geometrical magnetic frustration. While our recent experiments on La2O2Fe2OSe2 reveal evidences of magnetic frustration, La2O2Co2Se2 and La2O2Mn2OSe2 have not been explored by inelastic neutron measurement which can provide important microscopic information on magnetic interactions in ordered phase and fluctuation in paramagnetic phase. We would like to propose time-of-flight neutron scattering experiments on Co- and Mn-oxychalcogenide at MARI where the range of excitation energy can be covered up to 200 meV with fine energy resolution which is suitable for investigating high-energy spin excitations and low-energy spin fluctuation expected in these systems