3, 6-Dihydrazine-1, 2, 4, 5-tetrazine and decahydrodecaboric acid were synthesized from the starting material 3, 6-di(3, 5-dimethyl pyrazole)-1, 2, 4, 5-tetrazine and [N(C₂H₅)₄]₂B₁₀H₁₀, respectively. Dihydrazine-1, 2, 4, 5-tetrazine decahydrodecaborate was obtained by neutralization reaction with the yield of 80%. The compound was characterized by IR, ¹H NMR, and elemental analysis. Moreover, the combustion heat of the compound determined by oxygen bomb combusion is 37.5 kJ·g^-1.