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We report a new search of weakly interacting massive particles (WIMPs) usingthe combined low background data sets in 2016 and 2017 from the PandaX-IIexperiment in China. The latest data set contains a new exposure of 77.1 liveday, with the background reduced to a level of 0.8$\times10^{-3}$ evt/kg/day,improved by a factor of 2.5 in comparison to the previous run in 2016. Noexcess events were found above the expected background. With a total exposureof 5.4$\times10^4$ kg day, the most stringent upper limit on spin-independentWIMP-nucleon cross section was set for a WIMP with mass larger than 100GeV/c$^2$, with the lowest exclusion at 8.6$\times10^{-47}$ cm$^2$ at 40GeV/c$^2$.

Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment