This paper discusses the obtaining of enterprise competitive advantage based on the strategy of delivering customer value from the perspective of sustainable marketing. First of all, it provides an overview of customer value. Second, the paper explores the relationship between customer value and enterprise competitive advantage. Then it proposes the STV triangle model which stands for Strategy, Tactic and Value for sustainable marketing system in company. Finally, it describes how the virtuous circle within the triangle contributes to enterprise competitive advantage by identifying customer value, providing customer value and then promoting the value.