Connection-oriented transmission protocol in the wireless narrowband broadcast channel is a kind of data link layer protocol for constituting a network in the wireless narrowband broadcast channel. In the way of how to design a communication protocol, the design of wireless data network transmission protocol frame structure, the design of initialization process, the design of data transmission process and the mechanism of the time slot dynamic management are introduced. From a practical effect, since the time-division multiplexing transmission mode, the mechanism of the time slot dynamic management and the connection-oriented service are used in the protocol. The problem of the low data communication efficiency in the wireless narrowband broadcast channel is solved. Additionally, the reliable IP data transmission is transparently provided based on the TCP/IP architecture.