  A new QCD sum rule analysis on the spin-isospin averaged $\rho$, $\omega$ and
$\phi$ meson-nucleon scattering lengths is presented. By introducing the
constraint relation on the the low energy limit of the vector-current nucleon
forward scattering amplitude, we get $a_\rho=-0.47\pm 0.05$ fm,
$a_\omega=-0.41\pm 0.05$ fm and $a_\phi=-0.15\pm 0.02$ fm, which suggests that
these V-N interactions are attractive. It is also proved that the previous
studies on the mass shift of these vector mesons in the nuclear medium are
essentially the ones obtained from these scattering lengths in the linear
density approximation.
