The system completed successfully. With the rapid development of the Internet today, online communication has become a means of communication for many people. The system is designed to achieve instant communication on the Internet. It is an instant communication tool implemented by the most popular Java programming language today. Prototype, many aspects involved are commonly used technologies or difficulties in Java. You can apply for a number through the system, and after applying for a number, you can log into the system to do some simple operations and settings such as adding friends and grouping friends, and then you can communicate with your friends like instant sending, instant reply, etc. The system can be run on the Internet or on a local network, so that users can easily exchange information.