The research focuses on analyzing the marketing - mix strategy of Duy Tri Coffee brand in order to develop Duy Tri Coffee brand when competition in the market becomes increasingly fierce. On the basis of the theory of marketing-mix strategy for brand development, the authors use qualitative research with 300 randomly selected customers to assess the status of marketing-mix strategies in brand development. Duy Tri coffee. Research results show that Duy Tri coffee needs to flexibly change its product strategy, price, distribution and marketing mix in response to changes in the business environment in order to develop its brand. At the same time, the research also shows that Duy Tri Coffee has not well implemented communication and promotion activities, affecting the development of Duy Tri Coffee's brand in the context of volatile competition.