The existing Multiple Input Multiple Output（MIMO） terahertz communication network dual-channel Medium Access Control（MAC） protocol works on the WiFi channel and the terahertz channel. If multiple pairs of nodes simultaneously transmit data in the terahertz channel

the problem of beam overlap interference occurs

which will reduce the message transmission success rate and network throughput. In addition

there is also a control overhead redundancy problem when the WiFi channel is exchanged for control messages

resulting in channel utilization low. Considering these two issues

the article proposes an Efficient Terahertz Dual-channel MAC Protocol to Avoid Beam Interference（E-ABIMAC）. E-ABIMAC is divided into beam interference pre-judgment mechanism

relay assistance mechanism and node information omission based Clear to Send frame/Acknowledgement frame（CTS/ACK） mechanism. The simulation results show that compared with the existing dual-channel MAC protocol for MIMO terahertz communication networks

the network throughput of the proposed protocol is increased by 10.1%

the channel utilization rate is increased by 11.7%

and the message transmission success rate is increased by 6.5%.