learn more about some financial businesses, such as RMB business and foreign currency business. Business involves online banking, ACE/ counter, call center, credit, asset custody, fund risk analysis system, etc., as well as a large number of intermediary businesses, such as foreign exchange trading and fund business, etc. Some systems are particularly closely related, so the test will also involve the test of related system interfaces, and it is often necessary to construct the environment, data and business of external systems. If the system is oriented to online customers, the most important thing is to consider security first, followed by the number of online users and concurrent users.