Abstract: The water cut is usually determined by the buckely-leverett equation, which represent water cut in certain time. with the development of oil field, the water cut varies continuously. so it is necessary to predict the water cut of well on the different location during the different period when the well pattern is ad-
justed. in this paper, the model of the water-cut is set up by using the dynamic and static date of the well that is known by the method of fuzzy neural networks. this model can predict the water cut of the arbitrary well and period.

Key words: water cut, fuzzy neural networks, predictiod