Nano-composite energetic materials,hexahydro-1,3,5-trinitro-1,3,5-triazine/resorcinol-formaldehyde (RDX/RF) aerogel,was prepared by crystallization of RDX in the N,N-dimethyllformamide (DMF) within the nano-dimensional pores of resorcinol-formaldehyde (RF) gel matrix. The structures of RDX/RF aerogel were characterized by atomic force microscopy (AFM),scanning electron microscopy (SEM),X-ray powder diffraction (XRD),and BET method. Experimental results show that the grid size formed by RF ranges from several to several decade nm and the mean size of nano-RDX in RDX/RF is 38 nm. The specific surface area for RF aerogel is 551.5 m²·g^-1,and for RDX/RF aerogel is 142.7 m²·g^-1. Compared to the corresponding values of the mechanical mixtures with the same components,the exothermic peak of RDX/RF aerogel moves down about 25 ℃,and the mechanical sensitivity decreases a little.