Laser sensitive coordination compound 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole cobalt (Ⅱ) perchlorate dihydrate(TACo) was synthesized with the yield of 71%. The structure of the obtained compound was identified by IR and elemental analysis. The laser sensitivity and part of the explosive performance were tested. The 50% fire energy density in 915 nm laser wavelength was 39.85 J·cm^-2. Results show that the temperature and particle size of the samples have significant effects on the synthesis reaction.