In recent years, the new energy market has become the focus of the investment. CATL, as the midstream of the industry, and BYD and CCAG, as the downstream of the industry, have jointly promoted the development and growth of the new energy industry. As the representative of new energy vehicles, BYD has been favored by the capital market. The purpose of this paper is to provide an in-depth analysis of the investment value of CATL, BYD, and CCAG from three aspects: policy support, market demand, and technological innovation, and a comparative analysis of them. The focus is on BYD stock's position in the new energy sector. By analyzing past market data, and financial reports, this paper first introduces China's policy support for new energy vehicles, including subsidies, quotas, and other incentives. Second, it analyzes the market demand for new energy vehicles, focusing on the market size, consumer preferences, and market potential of the new energy vehicle market. Third, this paper analyzes the technological innovation of new energy vehicles, including battery technology, electric power system technology, and intelligent driving technology. Based on the above analysis, this paper concludes that BYD and its energy electric vehicle market have strong investment value. However, in the face of fierce competition, BYD needs to continue to strengthen its technological innovation, enhance its brand influence, and seize market opportunities to maintain its competitive advantage.