1-Methy-4, 5-dinitroimidazole(4, 5-MDNI) was prepared. The single crystal of 4, 5-MDNI was cultivated. The single crystal structure was determined by a X-ray diffractometer. The results show that the crystal is orthorhombic, space group Pna2(1)/n with crystal parameters of: a=0.8412(2) nm, b=1.2646(1) nm, c=0.6563(1) nm, V=0.6982 (3) nm³, Z=4, D_c=1.637 g·cm^-3, μ=0.15 mm^-1 and F(000)=352. The impact and friction insenstitvity of 4, 5-MDNI were tested by GJB772-1997 method. 4, 5-MDNI is insensitive to impact and friction and close to TATB.