Abstract: In view of A, B, C and D four types of waterdrive curves’practical application in oil field, this paper proposed a new method for selection of appropriate waterdrive type curve based on the regularity of water?cut growth of oilfield. Through obtaining the related water cuts and expressions from these four types of curves’formulas, the discrimination of the expression functions is made in terms of monotonicity, inflection point and extreme value point, and then the characteristic pattern and chart reflecting the four waterdrive?type?curve regularities are gained. By comparison between real water?cut rising regularity of an oilfield and the characteristic chart, we can quickly select the appropriate type curve for guiding oilfield development. The case study shows that this method is reliable, effective, simple to use and worthy of popularization