3,6-Diamino-1,2,4,5-tetrazine(DAT) was synthesized by nucleophilic substitution using 3,6-bis(3,5-dimethylpyrazol) -1,2,4,5-tetrazine (BT) as the precursor. Then the 3,3′-azobis(6-amino-1,2,4,5-tetrazine) (DAAT) was obtained from oxidative coupling reaction of DAT, and the energetic compound 3,3′-diazenebis(N-(2,2,2-trinitroethyl)-1,2,4,5-tetrazin -6-amino) (BATAT) was first synthesized from 2,2,2-trinitroethanol and DAAT. The structure of BATAT was determined by MS, ¹H NMR and ¹³C NMR. The density, heat of formation, detonation velocity and pressure of BATAT were calculated by Monte-carlo method and Kamlet-Jacobs formula. Results show that the density, detonation velocity and pressure are 1.827 g·cm^-3, 8.76 km·s^-1 and 34.11 GPa, respectively.