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Broad dispersions of operation parameters are generally observed with continuous resistive switching. In this letter, we explore a prototype resistive random access memory (RRAM) device for switching uniformity improvement. Compared with Al/CuxO/Cu structure, by introducing a thin phase-change Ge2Sb2Te5 (GST) film between CuxO and Al top electrode, the device exhibits much better resistive hysteresis and switching uniformity. A combined filamentary conduction model is proposed to clarify the role of GST layer on the resistive switching stabilization.