Some nodes and other network nodes are within the communication range of each other in the normal data transmission process, which may lead to interference in the data transmission. In order to solve the problem of data interference in the Media Access Control (MAC) protocol of multi- Personal Area Network （PAN） Terahertz Wireless PAN （WPAN） in the normal channel time allocation period, a low interference multi-PAN MAC protocol for Terahertz WPAN is proposed. By classifying normal nodes, the concept of edge node type is proposed to find out the normal nodes that may cause interference. Adaptive normal node type reporting mechanism is applied, which may inform the Piconet Coordinator （PNC）of the node type of the normal node. A new mechanism for normal node slot allocation is also used, which enable the PNC to allocation slot resources according to the normal type. Therefore, the interference of conventional nodes in the process of data transmission is reduced. The data transmission success rate and network throughput are improved effectively, and the average delay is reduced.