In present study, the dynamics of stretching-stretching and stretching-bending
entanglement in H_2O are studied with considering the inherent decoherence process.
It is shown that the excitation in the bending vibration can lead to the decrease
of the generation rate of stretching-stretching entanglement for the non-superposed
state and the degeneration of entanglement for the initial entangled states. For specific
initial entangled states, the stretching-stretching entanglement can live for a long time,
and the correspondence between energy transfer and entanglement is still maintained
for the initial local mode states. For the stretching-bending vibrations, the stretching-bending
entanglement is much lower than the stretching-stretching vibration, and
the degeneration rate of stretching-bending entanglement is higher than that of the
stretching-stretching entanglement. The excitation in the remaining stretching vibration
can induce a higher degree of stretching-bending entanglement.