Abstract: The deformation and instability characteristics of ligaments in chiral honeycomb control the impact resistance of these materials. In this paper, the impact dynamic load coefficient of ligament and the critical pressure of ligament instability in the first stage of in-plane shock buffering were discussed by means of energy method and extremum analysis of functional exponential function, then the analytical expression of the dynamic load coefficient and the critical pressure instability were obtained, and then the internal micro-structural collapse mechanism and the key influencing factors of impact resistance of the chiral honeycomb material were revealed. The results show that the larger the torsion angle of the ligament node ring, which is regarded as the torsion spring, during impact compression deformation, the smaller the dynamic load coefficient of the ligament, while the pressure of instability of the ligament increases with the torsion angle of the node ring. The research methods and results can provide reference for the further research and microstructure design of the impact resistance of chiral honeycomb materials and similar honeycomb materials.