The theory of customer lifetime value was used in this paper to subdivide power customers. A measurement system for power customer value was achieved through survey and investigation, and the Analytical Hierarchy Process （AHP） was adopted to determine the weight of every index. For example, this paper calculated the current value and potential value of the selected customers, pointed out the types, and put forward the specific marketing strategies. Practice shows that the power customer segmentation method can be used as reference for power enterprises marketing.