Based on a recent high-level ab initio potential energy surfaces,the state-to-state photodissociation dynamics from the initial vibrationally excited H2O in its second absorption band has been investigated.The photodissociassion dynamics from three fundamental vibrational excited states of H2O were explored from quantum dynamical calculations including the electronic(X)and(B)states,comparing with the ground vibrational state.The calculation is based on a Chebyshev real wave packet method.Due to the different shapes of initial vibrational wave functions,different absorption spectra,ro-vibrational distributions and branching ratios have yielded.The absorption spectrum of the bending excited vibrational state(0,1,0)shows two lobes with a shallow minimum and a dominant vibrational inverted population OH((X),v =1)fragment at higher energy and a nearly single rotational product propensity.The bond stretching vibrational states(0,0,1)and(1,0,0)show high OH((A))/OH((X))ratios at short photon wavelength,which indicates that dissociation process mainly via the adiabatic channel.