5-Hydrazinotetrazole as an intermediate was synthesized from 5,5′-azotetrazolate by acidizing of hydrochloric acid and recrystallizing of sodium acetate,respectively. 5-Hydrazinotetrazole mercury perchlorate (HTMP) was synthesized from 5-hydrazinotetrazole by complex reaction with mercury acetate and perchlorate. Its structure was characterized by using Fourier transform infrared (FTIR), energy dispersive spectrum (EDS) and elemental analysis. Thermal decomposition of HTMP was discussed. The laser sensitivity of HTMP was tested by Langlie method. Results show that HTMP is sensitive to laser. Under no-doping condition, the 50% ignition energy of HTMP is 972 mJ, while BNCP could not be ignited. When doping 5% carbon black by weight, the 50% ignition energy of HTMP and BNCP are 2.56 mJ and 59 mJ. Mechanical sensitivity of HTMP is similar to that of BNCP.