MAC (Media Access Control) protocol provides a channel sharing scheduling mechanism, it ensures sharing of channel resources between multiple communication nodes fairly and efficiently, which is also an important part of distributed network, and is a key factor that affects the performances of a network directly. This paper introduces a dual channel technology that combines SPMA and TDMA media access control protocol, not only ensure the reliable operation of the network, but also ensure the special business requirement for time delay. The results of the study have certain engineering application value.