  We study the flavor changing neutral current couplings of new heavy quarks
through the Z' models at the LHC. We calculate the cross sections for the
signal and the corresponding standard model background processes. Considering
the present limits on the mass of new heavy quarks and the Z' boson, we
performed an analysis to investigate the parameter space (mixing and mass)
through different Z' models. For an FCNC mixing parameter x=0.1 and the Z' mass
M_{Z'}=2000 GeV, and new heavy quark mass m_{t'}=700 GeV at the LHC with
\sqrt{s}=13 TeV, we find the cross section for single production of new heavy
quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb and 1.2 fb within
the Z'_{\eta} , Z'_{\psi} , Z'_{LP} and Z'_{\chi} models, respectively. It is
shown that the sensitivity would benefit from the flavor tagging.
