N-(2-fluoro-2, 2-dinitroethyl) -1, 5-diaminotetrazole-1H was synthesized by a one-step Mannich reaction under mild conditions using 1, 5-diaminotetrazole-1H and 2, 2-fluorodinitroethanol as starting materials. Its molecular structure was deter- mined by X-ray single crystal diffraction analysis. It crystallizes in orthorhombic system, space group Pca2₁, with a crystal densi- ty of 1.77 g·cm^-3 at 173 K. The different interactions in crystal were analyzed by Hirshfeld surface. In the analysis, the dominant intermolecular interactions in the crystal and their distributions were (R is a proportional abbreviation):R_O…H/H…O=27.0%, R_N…H/H…N=21.5%, R_{F…O/O…F/F…H/H…F/N…F/F…N}=15.9%, mainly hydrogen bonding and halogen bonding interactions. The thermal stability was studied by thermogravimetry and differential scanning calorimetry(TG-DSC). At a heating rate of 5 ℃·min^-1, there was only one sharp decomposition peak with the temperature at 177.32 ℃, and the mass loss was 92.53% demonstrating a nearly complete decomposition at such temperature. Its activation energy were calculated by using Kissinger method and Ozawa method as 213.228 kJ·mol^-1, 209.984 kJ·mol^-1 respectively, which were shown. A spatial reticulated porous structure were observed according to the field emission-scanning electron microscopy(FE-SEM)analyses.