Abstract: In 1972, Hung-chia Yang in Taiwan studied the tooth form of the lowerjaw and the articular bones of largehead haitail. He derived the largehead hairtail in theDong Hai Sea into two subspecies. The point-toothed fish were designated Trichiuruslepturus auriga and the barb-toothed fish Trichiurus lepturus lepturus. In 1977,Mr. Sin-che Lee also classified the largehead hailtail into two species further. Onewas thin ribbon fish (T. japonicus with pointed teeth), the other was fat ribbon fish(T. lepturus with barbed teeth). To make clear the question,we collected 586 specimensfrom the Dong Hai Sea and Huang Hai Sea(28-33°N, 123-126°E) during the periodof spring in 1982 to summer in 1984,and repeated Yang and Lee's Work. Some cova-riance analyses for the body admeasurement,the tooth form of lower jew,the shape ofarticular bone and the number of gillrakes of the fish have been studied synthetically.The results show that there is only one species of largehead hairtail Trichiurus leptu- rus Linnaeus (1758) in the Dong Hai Sea and Huang Hai Sea. Yang and Lee classifi-cation are invalid.