With the advances of the Internet and information technology, the digital era provides the development of enterprises with a new space: a digital economy platform. The increasing number of enterprises enter the platform market, which makes the competition among platform companies extremely fierce. Therefore, how to improve competitiveness in order to survive and develop in the fierce competition has become an important topic. This article takes Taobao, JD, and PDD as examples by focusing on case and comparative analysis. Through using SWOT analysis, this paper study the strengths, weakness, opportunities and threats of the three platform companies. Combined with the research results, there are some competitive strategies analyzed and proposed: efficient supply chain and after-sales service strategies, price competition strategy, product quality strategy, differentiation strategy, science and technology development strategy, cost leadership strategy, innovation strategy and cooperation strategy. These competitive strategies can provide a reference for the long-term development of platform enterprises.