Short message service play s a mo re and more important role in information industry .The principle of data exchange was introduced between the SP of Netcom SMS and Netcom SMSC , the SP of Netcom SMS and the user terminals of mobile telephones.The design idea of multi -protocol and multi -gateway short message platform was put forth based on CNGP, CMPP and SGIP protocol.The expansibility of short message platform was researched.The implementation method of subordinate SP interface and access-model of integrating different platforms were given .Users can access short message platform by using either Web or PC terminals.The design principle and implementation method of the SP' s short message value -added service were described .The system has run for over one year .I t has been proved that the system is reliable , secure , accurate and quick and gains the anticipative result .This system provides referenced values for the designs of all kinds of short message service platforms.