Based on event system theory, this paper takes the development process of Geely after its acquisition of Volvo for ten years as a case study to investigate how emerging economy enterprises overcome source country disadvantages after their cross-border acquisitions of developed country enterprises. The study finds that the legitimization strategy of emerging economy enterprises based on event system theory overcomes source country disadvantages mechanism, and overcomes institutional source country disadvantages first, and then institutional dimension and product dimension source country disadvantages in parallel. Later on, innovation and technology strength is used as the core competitiveness to achieve the strategic goal of globalization.