  The dijet signature at the LHC is studied in new physics models for the top
forward-backward asymmetry at the Tevatron. In the t-mediator models,
flavor-changing interactions contribute to the dijet production cross section
as well as the asymmetry at least at the one-loop level. It is found that the
LHC dijet measurements at 36pb^(-1) have constrained the Z' coupling larger
than 2.5-3. The sensitivity is expected to be improved significantly as the
integrated luminosity increases in the LHC.
