Brokerage institutions refer to institutions that engage in securities brokerage business and provide investors with securities trading, investment consulting, financial management and other services. The main businesses of brokerage institutions include securities brokerage, securities investment consulting, financial management, asset management, margin trading, investment banks and investment funds.

Investors should consider the qualification, service quality, transaction cost, transaction system and other factors when choosing a brokerage institution. First of all, investors should ensure that brokerage institutions have legal qualifications and good reputation. Secondly, investors should consider the service quality of brokerage institutions, including timeliness, professionalism and reliability of services. In addition, investors should also consider the transaction cost of securities firms and the security and reliability of the trading system. Finally, investors should also consider the investment advice of brokerage institutions and investors' risk tolerance.

In a word, investors should consider the qualification, service quality, transaction cost, transaction system and other factors when choosing brokerage institutions to ensure the maximization of investors' interests.