disclosed is a link margin adaptation method using feedback information of a wireless communication system . for transmission and reception of data between two nodes of the wireless communication system , a transmission node requests a receiving node to transmit a link margin . the transmission node receives the link margin , and selects one of a white noise table or a delay spread table according to a delay spread value between the two nodes . then , the transmission node adapts a link between the two nodes to a transmission mode and decides a transmission rate to transmit data at the decided transmission rate , thereby improving transmission capacity of the wireless communication system , obtaining the optimum link state , extending power utilization time of stations , and reducing interference between stations .