Investment banks in the United States first emerged in the early 19th century, with a focus on securities underwriting. Compared with other countries, the United States investment banks were established earlier, and after the subprime crisis, the United States investment banks, through their own exposure to business problems, improved so that they have a more perfect regulatory system and a more advanced business model. As a result, in the process of developing its own business, China's investment banks should take the essence and discard the dross in order to find a suitable development direction for themselves, gaining recognition in the capital market construction and promoting the further improvement of China's international status. This paper uses literature analysis and comparative analysis to explore the differences between the operating models of investment banks in China and the US, and to provide insights and suggestions for the development of Chinese investment banks. The study finds that investment banks in China should expand the attribution model, thereby increasing the concentration of capital. At the same time, the proportion of securities brokerage business should be adjusted and the leverage ratio in the industry should be strictly controlled to avoid excessive internal consumption.