Combustion characteristic of Zr-O₂ was studied. Emission spectrum of Zr-O₂flashlamp was also tested. Results show that the higher the ignition voltage (22 V) is, the more the oxygen (0.7 MPa) is and the smaller Zr strip (0.3~0.5 mm) is, the higher fire ratio is. The spectrum of Zr-O₂ pyrotechnics is distributed from 500-900 nm, and it has stronger emission strength in near infrared region of 700-900 nm. The spectrum characteristics are almost the same in different ratios of fuel/oxygen.