The statistical entropy of the Kaluza-Klein black hole is studied by counti
ng the black hole states which form an algebra of diffeomorphism at Killing
horizon with a central charge. It is shown that the entropy yielded by the
standard Cardy formula agrees with the Bekenstein-Hawking entropy only if
we take period T of function u as the periodicity of the Euclidean black ho
le. On the other hand, the first-order quantum correction to the entropy is
proportional to the logarithm of the Bekenstein-Hawking entropy with a fac
tor -1/2.