Abstract: Effects of cell micro-topology on the in-plane dynamic crushing properties of honeycombs were numerically studied. The dynamic crushing of the honeycombs filled with the differently micro-arranged cells was discussed in case of these cells with the same side length and thickness. The full-scale deformation of the specimen and the micro-structure dynamic evolution were given. Influences of the cell micro-arrangements on the energy absorption mechanism of the honeycombs were clarified. Results show that except for the basic structural parameters (e.g. side length and thickness) of the cells, the cell shape and its arrangement pattern are important to determine the dynamic responses of honeycombs. Due to the structural stability of triangular cells, the honeycombs with triangular cells display stronger energy absorption ability than those with square cells. Stagger arrangement of the cells yields to more uniform deformation and stable plateau stresses. Owing to the variation of the micro-topology, the honeycombs with the staggerly-arranged cells reveal particular necking phenomena during the in-plane crushing.