  We present results for the photoproduction of $\omega$ and $\phi$ meson in
the nucleon isotopic channles. A recently developed quark model with an
effective Lagrangian is employed to account for the non-diffractive {\it s}-
and {\it u}-channel processes; the diffractive feature arising from the {\it
natural} parity exchange is accounted for by the {\it t}-channel pomeron
exchange, while the {\it unnatural} parity exchange is accounted for by the
{\it t}-channel pion exchange. In the $\omega$ production, the isotopic effects
could provide more information concerning the search of "missing resonances",
while in the $\phi$ production, the isotopic effects could highlight
non-diffractive resonance excitation mechanisms at large angles.
