  We study the deviation of yukawa coupling in the gauge-Higgs unification
scenario from the Standard Model one. Taking into account the brane mass terms
necessary for generating the flavor mixing and removing the exotic massless
fermions, we derive an analytic formula determining the KK mass spectrum and
yukawa coupling. Applying the obtained results to the tau and bottom yukawa
couplings, we numerically calculate the ratio of the yukawa couplings in the
gauge-Higgs unification and in the Standard Model.
