1. Business cooperation: Investment banks and the business departments of securities companies can carry out business cooperation to provide customers with comprehensive financial services. For example, brokerage investment banks can provide corporate financing, mergers and acquisitions and other services, while the business department is responsible for communicating with customers, selling products and providing consulting services.

2. Information sharing: information can be shared between investment banks and brokerage business departments to improve business efficiency and accuracy. Securities investment banks can share market research, investment strategies and other information to the business department to help the business department better understand the market dynamics and product characteristics, so as to better communicate with customers and promote products.