Electric conductivity of laser plasma and its characteristic parameters were studied by parallel-plate electrode method for pulsed Nd∶YAG laser ignition of boron-potassium nitrate. The ignition threshold values of laser plasma of B-KNO3 (40/60 mass fraction) and B-KNO3-phenolic resin (40/60/0.5 mass fraction) are 34.07±8.06 J/cm2 and 28.56±2.62 J/cm2, and their ionic charge flux and average kinetic energy are 1.82×10-5 C/(mm2·s), 10.85×103 eV (at 62.05 J/cm2) and 2.29×10-5 C/(mm2·s), 13.61×103 eV (at 60.80 J/cm2) respectively. The ignition delay time of plasma depends on laser energy density in exponential decay, and the delay time of B-KNO3 doped phenolic resin is larger than that of B-KNO3 under a relatively low laser energy density, but same over 35 J/cm2. The results shown that phenolic resin accelerates the ablation of B-KNO3, and plays an important role to produce higher ionic concentration and kinetic energy of reactivity ablation products.