Tri-nitro-phenol(PA), tri-nitro-resorcinol(TNR) andtri-nitro- phloroglucinol(TNPG) salts of 3, 6-diguanidino-s-tetrazine(DGTz)were synthesized by reacting DGTz with PA, TNR and TNPG respectively.Thermaldecomposition characters of the title compounds were investigated by DSC and TG-DTG.At 10℃·min^-1 linear heating rate, thethermal decomposition processes of those salts showed that there was only oneexothermic peak for each salt between 50-450℃, and thetitle compounds were completely decomposed without any residue at 600℃. The kinetic parameters of the exothermic process of the titlecompounds were calculated by Kissinger′s method andOzawa-Doyle′s method, and the Arrhenius equations wereobtained. Conventional sensitivity properties were determined, showing that thethree salts were insensitive to friction, impact and flame.