The work aims to study the influence of configuration parameters and compression velocity of triangular honeycomb on the out-of-plane compression performance. Ansys/LS-DYNA was employed to create the finite element model for dynamic out-of-plane compression of triangular honeycomb based on the representative cell and the simulations of triangular honeycomb cores with various cell configuration parameters under the out-of-plane compressions were carried out. For triangular honeycomb, when all configuration parameters were fixed, the out-of-plane dynamic plateau stress was related to the compression velocity by quadratic polynomial equation. For a given compression velocity, the dynamic out-of-plane plateau stress of triangular honeycomb with a fixed expanding angle was related to the ratio of cell wall thickness to edge length by a power law. Fot the triangular honeycomb with a fixed ratio of cell wall thickness to edge length, the out-of-plane dynamic plateau stress is related to the expanding angle by a quadratic relationship curve. With the same relative density, SEA of regular triangular honeycomb is larger than that of regular hexagonal honeycomb; and the correlations between out-of-plane dynamic plateau stress and compression velocity (or cell configuration parameters) can be well fitted by certain curves.