3-amino-6-(3,5-dimethylpyrazol-1-yl)-S-tetrazine(ADMPT), 3-hydrazino -6-(3,5-dimethylpyrazol-1-yl)-S-tetrazine(HDMPT), 3,6-diamino-S-tetrazine(DATz), 3,6-dihydrazino-S-tetrazine(DHTz), 3,3'-azobis(6- amino-S-tetrazine) (DAAT) and some S-tetrazine high-nitrogen energetic compounds were synthesized. The structures of these compounds were represented and confirmed by IR, element analysis, 1H NMR and 13CNMR spectra. The thermal decomposition performance of DAAT and DHTz was investigated. Kinetic parameters of decomposition were obtained by DSC at different heating rates. The results show that DAAT is stable up to 283℃, with maxima exotherm at 330℃ and ΔH of 1974.33J/g. DHTz is stable up to 120℃, with maxima exotherm at 159℃ and ΔH of 1843.23J/g. The explosive power performance of DAAT and DHTz was calculated by VLW EOS.