Disclosed is a method for reducing wireless-body-area-network (WBAN) system interferences. The method includes: a second multi-port repeater hub2 of a second adjacent body area network BAN2 sends an activation superframe interlacing request to a first multi-port repeater hub1 of a first adjacent body area network BAN1, wherein the activation superframe request includes a beacon offset sequence of the BAN2; and the hub1 feeds back an activation superframe interlacing response to the hub2 after performing judgment according to the beacon offset sequence of the BAN2, wherein the fed back activation superframe interlacing response includes a beacon offset sequence of the BAN1. After the method for reducing the WBAN system interferences is applied, generation of strong interferences between beacons is prevented so that transmission performance of BAN edge nodes and overall performance of a system are effectively ensured.