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Two kinds of different mechanistic oscillations can be displayed in the H2O2-KSCN-CuSO4 NaOH system. One discovered by this study is the pH oscillation in a continuous flow stirred tank reactor(CSTR) resulting from the oxidation of KSCN. The other is the oscillation of H2O2 experimental conditions, the system exhibits a birhythmicity in a CSTR. Two different pH oscillations are reported here. The pH oscillations which accompany the decomposition of H2O2 exist in the batch reactor and the CSTR at a high flowrate, but the pH oscillations in a CSTR at a low flowrate originates from proton positive and negative feedback in the oxidation of KSCN. The os-cillation of non-catalyzed oxidation of KSCN by hydrogen peroxide in a CSTR can be found.Also we have observed whether Cu2+ exists or not in the batch system, the pH increases to near neutral ultimately after pH drops twice.