  I review the derivation of large-N QCD meson scattering amplitudes in the
Regge regime, where the effective theory of long strings applies in d=4. A
special attention is payed to the reparametrization path integral which plays a
crucial role in the consistency of off-shell amplitudes. I show how the linear
Reggeon trajectory is obtained for QCD string in the mean-field approximation,
which turns out to be exact for the Nambu-Goto string, and discuss the
interrelation with perturbative QCD.
