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The initiation reaction rate constants for the formation of ·OH and H2O2 were produced in water by a novel nanosecond pulsed plasma power, which was developed for wastewater treatment based on the theory of magnetic pulse compression and SOS effect. The output voltage was observed where the peak voltage, rise time, and pulsewidth were 51 kV, 60 ns, and 120 ns, respectively. The results show that the concentrations of ·OH and H2O2 both increased with increasing the peak voltage; the initial rates of ·OH are 4.1, 5.7, and 7.7 × 10-10 mol·s-1 at 30, 35, and 40 kV, respectively, and the initial rates of H2O2 are 1.2, 1.9, and 2.6 × 10 9 mol·s-1 at 30, 35, and 40 kV, respectively. The energy efficiency of the production of ·OH was found to be independent of the applied peak voltage, but the energy efficiency of the production of H2O2 increased with increasing the discharge peak voltage.