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The dynamic mechanical behavior, including free vibration and impulsive impact, of light-weight lattice cellular materials are investigated in this paper.Free vibration analysis is performed by experimental investigation and theoretical study.Based on continuum assumption, an equivalent vibration analysis is performed for lattice sandwich cylinder by using the classical shell theory.The analytical natural frequencies of the Kagome cores sandwich cylinder are verified by finite element simulation.The influences of microscopic geometrical parameters on natural frequency are then investigated.Filament winding and twice co-curing processes were proposed to make a carbon fiber reinforced composite (CFRC) sandwich cylinder with Kagome cores.Concurrent with the analytical modal response investigations, an experimental program is conducted to obtain the natural frequencies and vibration mode.Good agreement is achieved between the testing results and theoretical prediction.Based on a three-stage framework, an analytical model is proposed to study the dynamic response of lattice sandwich plate under air blast impact.The transmitted impulse is predicted in the fluid-structure interaction stage for a spherical explosive impact.The large deformation effect of front face sheet and the microstructure deformation of the lattice core are considered in the core compression stage.Non-uniform deformation of the sandwich plate is analyzed in the final stage.Both the transmitted impulses and maximum deflection of back face sheet of the lattice sandwich plate predicted by the theoretical model agree well with the experimental results.