With the rapid development of big data technology， e-commerce platforms have obtained unprecedented opportunities for transformation. This paper studies the online and offline integration development mode of e-commerce platform in the era of big data， profoundly analyzes the history and current situation of e-commerce development， clarifies the development trend of the combination of online and offline， and discusses its important role in e-commerce platform. At the same time， it introduces the potential application value of big data in optimizing customer experience， improving supply chain efficiency and enhancing personalized service. From the theory and model level， this paper studies the innovative development strategy combining online and offline， aiming to promote the development of e-commerce platform and enhance the market competitiveness of e-commerce platform.