The JICQ is the bureau area which JAVA writes according to "Customer s Machine/Server"(C/S) mode message solid hour correspond by letter tool system, the system adopted the SQL Server2000 of Microsoft company as a backstage database, the system passes a JDBC interview database. The system is divided into the server procedure and customer s procedure two parts, server and customer adoption "Transmission Control Protocol"(TCP), connect a word (Socket) conjunction through a set, the adoption "User Datagram Protocol "(UDP) of the customer s, pass a data report a set to connect a word (DatagramSocket) establishment a conjunction. The system has customer registration, customer to register, increase good friend, delete good friend and send out and receive news etc. function.-JICQ The bureau is the area which write Java s according to the "Customer s Machine/Server" (C/S) mode message solid hour correspond by letter tool system. the system adopted the SQL Server2000 of Micros oft company as a backstage database, the system passes a database JDBC interview. Th e system is divided into the server procedure an d customer s procedure two parts. server and customer adoption "Transmission Co. ntrol Protocol "(TCP), connect a word (Socket) through a conjunction s et. the adoption "User Datagram Protocol" (UDP) of the customer s, pass a data report a set to connect a word (Datagr amSocket) establishment a conjunction. The sy stem has customer registration, customer to register, increase good friend, delete good friend and send out and