As an important intermediate for new energetic materials, 2-(dinitromethylene)-1, 3-diaza-cyclopentane(DNDZ) attracts more attentions in recent years. Herein the necleophilic reaction between 1, 1-diamino-2, 2-dinitroethylene(FOX-7) and 1, 2-diaminoethane catalyzed by magnesium ion was studied and the DNDZ was synthesized in yield of 83.9% with high purity (99%) under the optimum conditions: the reaction temperature and time were 110 ℃ and 5.5 h respectively and the best catalyst was new prepared Mg(OAc)₂ (30%). The structure of the product was characterized by IR, NMR, MS and elemental analysis.