The deflagration of ammonia and oxygen on Pt-Rh(10%）and other metallic catalysts initiated by a single pulse from TEA CO2 laser is reported. The laser power threshold for initiating deflagration on catalyst is lower than that in the homogeneous gas system. The laser ignition threshold depends on the laser frequency, different metals used as the catalysts, the total pressure of gas mixtures and the ratio of partial pressure of NH3 and O2. An intense yellowish chemiluminescence is observed after a single laser pulse. The mechanism of the reaction is discussed.