The mechanical properties of three kinds of moderate and high density Nomex honeycomb used as aeronautical materials were studied.Furthermore,the effects of aramid paper's thickness,sollvent impregrated resin's concentration and environmental moisture on the mechanical properties of Nomex honeycomb were investigated.The results show that the moderate and high density Nomex honeycomb of good quality can be produced under the following conditions:moderate thickness aramid paper is chosen,the environmental moisture is controlled strictly,and penetrating agent is added to the solvent impregnated resin whose concentration is 35%～50%.The properties of this kind of honeycomb are comparable to that of the same kind of inputed product.