Ammonium dinitramide （ADN）， as a highly promising new oxidant， is still difficult to achieve large-scale applications due to its strong hygroscopicity. Numerous studies show that the strong hygroscopicity of ADN is mainly attributed to the formation of hydrogen bonds between NH₄⁺ cations and water molecules in air. In this work， a novel dinitramide energetic ionic salt （DBDN） containing divalent cation was synthesized by a simple， safe and efficient one-pot reaction using terephthalaldehyde （TPA）， aminoguanidine hydrochloride （AGC） and ADN as raw materials through Schiff base reaction and ion exchange reaction. The product was characterized by elemental analysis， infrared spectroscopy， and nuclear magnetic spectroscopy. Its physical and chemical properties were tested by thermal analysis， mechanical sensitivity testing， and theoretical calculations. In addition， the hygroscopicity of ADN and DBDN was studied by using the desiccator equilibrium method. The impact sensitivity （IS）， friction sensitivity （FS） and thermal decomposition temperature （T_d） of DBDN are >40 J， 16% and 225 ℃， respectively. The stability of DBDN is much better than that of ADN （5 J， 76% and 198 ℃）. Under the conditions of 25 ℃ and relative humidity （RH） of 66% and 75%， after 9 days， the saturated hygroscopic rates of the ADN are 24.1% and 39.5%， respectively， while those of DBDN are only 0.26% and 0.48%， showing non-hygroscopic properties of DBDN.