In conclusion, a set of high-accuracy global coupled PESs of X ̃ and B ̃ state of H₂O has been improved by adding more ab initio points in O+H₂ channel to the previous calculation data reported by Jiang et al. and fitting all points by the PIP-NN method. The structural, energetic, and spectroscopic properties of PESs are in a good agreement with experimental measurement. The quantum dynamical calculations were implemented by using a Chebyshev real wave packet method. The total cross section is consistent with the latest experimental measurements. The branching ratio of hydrogen generation is very small, and the product H₂ mainly distributes at the vibrational ground state with only X ̃ and B ̃ states considered. While diverting the initial wave packet from the Frank-Condon region to B ̃-D ̃ conical intersection, the calculated branching ratio of the H₂ generation channel increases obviously, which indicates the important role of the higher D ̃ state on the dynamics for the O+H₂ channel. It should be pointed out that a more accurate dynamical characterization of the X ̃-B ̃-D ̃ three-state model, as well as more experimental work, will be helpful to better understand the produce of O(1D)+H₂(X ̃¹~Σg+ ) from water photodissociation at different wavelengths.