  We discuss the meson-meson scattering and finite energy sum rule(FESR), based
on the one-loop calculation within U(3) chiral perturbation theory. First we
obtain the pertinent resonance spectroscopy from the unitarized partial wave
scattering amplitudes. Then we investigate how well the FESR can be satisfied
in the physical situation at Nc=3. Further discussions on the extrapolation of
Nc are also given.
