  We report the WIMP dark matter search results using the first physics-run
data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber,
operating at the China JinPing Underground Laboratory. No dark matter candidate
is identified above background. In combination with the data set during the
commissioning run, with a total exposure of 3.3$\times10^4$ kg-day,the most
stringent limit to the spin-independent interaction between the ordinary and
WIMP dark matter is set for a range of dark matter mass between 3.5 and 1000
GeV/c$^2$. The best upper limit on the scattering cross section is found
$2.5\times 10^{-46}$ cm$^2$ for the WIMP mass 40 GeV/c$^2$ at 90% confidence
level.
