  PACIAE, a parton and hadron cascade model, is utilized to systematically
investigate strange particle production and strangeness enhancement in Au+Au
collision and in Pb+Pb collision with the 200GeV at RHIC and 2.76TeV at LHC,
respectively. The experimental results at different centrality, which come from
the STAR collaboration and the ALICE collaboration, are well described by the
PACIAE model. This may represent the importance of the parton and hadron
rescatterings, as well as the reduction mechanism of strange quark suppression,
added in the PACIAE model.
