Recently resistive random access memory (RRAM) is considered to be the most promising one to become the next generation memory since its simple Metal/Insulator/Metal (MIM) structure, lower power consumption and fabrication cost (Meena, J.S., et al., 2014. Overview of emerging nonvolatile memory technologies. Nanoscale Research Letters, 9(1), p.526). Due to some bottlenecks for current flash memory, such as high operation voltage, low operation speed, poor retention time and endurance, RRAM device is regarded as an alternative solution (Fuh, C.S., et al., 2011. Role of environmental and annealing conditions on the passivation-free In-Ga-Zn-O TFT. Thin Solid Films, 520, pp.1489-1494). In this investigation, the memory layer of RRAM device is IGZO, and it is deposited with AP-PECVD technique which can operate under atmosphere, reduce cost of the process. Microwave annealing (MWA) is used to enhance the RRAM device reliability (Fuh, C.S., et al., 2011. Role of environmental and annealing conditions on the passivation-free In-Ga-Zn-O TFT. Thin Solid Films, 520, pp.1489-1494). Experiment shows that with appropriate MWA treatment, the IGZO RRAM device exhibits better electrical characteristics, reliability issues such as numbers of switching cycle and data retention time are also improved (Teng, L.F., et al., 2012. Effects of microwave annealing on electrical enhancement of amorphous oxide semiconductor thin film transistor. Applied Physics Letters, 101, p.132901).