A coupling reaction using hydrochloric acid and potassium permanganate as oxidizing agents was carried out to synthesize compound 1 from the polyamino fused heterocyclic compound 5-（6，7-diamino-3-imino-3H-［1，2，4］triazolo［4，3-b］［1，2，4］triazolo-2（7H）-yl）tetrazole. Subsequent displacement reaction in perchloric acid gave the perchlorate 2. The structure and thermal performance of compound 2 were characterized by X-ray single crystal diffraction， Fourier Infrared spectroscopy， Nuclear Magnetic Resonance， elemental analysis， differential scanning calorimetry （DSC） and thermogravimetry analysis （TG）. Additionally， the heat of formation was computed using Gaussian software， and the detonation properties of compound 2 were calculated using EXPLO5 software. The results showed that compound 2 crystallizes in the monoclinic crystal system， possessing a crystal density of 1.750 g·cm^-3 with four molecules per unit cell. The onset thermal decomposition temperature of compound 2 is 232.6 ℃， its theoretical detonation velocity and pressure are 8373 m∙s^-1 and 29.05 GPa， respectively. Remarkably， compound 2 exhibited insensitivity to external mechanical stimuli， evidenced by an impact sensitivity of 40 J and a friction sensitivity of 360 N， indicative of its robust performance overall.