  The roles of the vibration motions played in the excitation energy transfer
process are studied. It is found that a strong coherent transfer in the hybrid
system emerges when the detuning between the donor and the acceptor equals the
intrinsic frequency of the vibrational mode, and as a result the energy can be
transferred into the acceptor much effectively. Three cases of the donor and
the acceptor coupling with vibrational modes are investigated respectively. We
find that the quantum interference between the two different transfer channels
via the vibrational modes can affects the dynamics of the system significantly.
