Lightweight structure and material,such as cellular material,play an important role in vehicle engineering.In this pa-per,we design a novel negative Poissons ratio(NPR)lattice microstructure.The relative density formula for the NPR lattice material is firstly given.By using the single cell finite element model,parameters analyses are performed for the effective elastic modulus and Pois-sons ratio of NPR lattice microstructure.Then,the compression mechanical properties of the NPR lattice microstructure are studied by using the nonlinear finite element analysis program LS-DYNA.For the quasi-static compression analysis,the results show that the NPR structure has a wide range of stress plateau area,low first peak stress,an enhanced plateau stress and a wide range of the high ideal en-ergy absorption efficiency.Finally,using the NPR microstructure to design the crash-box,electric vehicle front collision analysis is car-ried out.Compared with the original model,the first step of the whole acceleration decrease obviously,and the intrusions of measure points are improved evidently.Though our current studies lack experiment validation,the simulation results have shown that NPR crash-box is better than the traditional crashbox,and NPR lattice microstructure has a great potential as the next-generation lightweight energy absorption material.