SDP协议是在IETF MMUSIC工作组的RFC2327中定义的一个多媒体会话描述协议，本文介绍了SDP协议的功能，分析了SDP协议格式，语法结构及解释，同时给出了一些应用。-SDP protocol is a working group in the IETF MMUSIC defined in RFC2327, a multimedia session descr iption protocol, SDP protocol paper introduces the functions of the SDP protocol format, grammar and explanations, and gives some applications.