This paper studied the effects of carbon black, graphite, KCl and olefin on the diode laser ignition characteristics of Zr/KClO₄ and carbon black on that of B/KNO₃, so as to provide experimental basis for changing characteristic of ignition composition ignited with diode laser. The experiments show that only carbon black can increase the laser sensitivity of the two ignition composition. The four dopants can decrease the delay times of the ignition composition, and the carbon black is the best while the graphite is the worst.