Abstract: A method of extending channels for the IEEE 1394 serial bus is provided. The method for extending channels of the IEEE 1394 serial bus in a channel assignment through an isochronous resource manager (IRM) of an IEEE 1394 node, wherein the node includes a CP register for physical channels and a CE register for extended channels which have the same format as the format of a CA register which holds information on channels assigned by the IRM, includes: checking whether all the channels of the IRM are used and there is available bandwidth; setting the value obtained by adding 64 to the value of the CP register, to the CE register when all the channels are used and there is available bandwidth; and generating a packet by setting a tag field value of a packet as a predetermined value when the value is set to the CE register. According to the present invention, it is possible to solve the shortage of the channels which can occur as the bandwidth increases.