Abstract: The morphological characteristics of different populations of Acrossocheilus parallens and Zacco platypus from Nanling and Wuzhishan were studied.The results showed that Acrossocheilus parallens and Zacco platypus belong to the same species.The comparisons were made in Nanling and Wuzhishan.Acrossocheilus parallens and Zacco platypus,whether in Nanling or Wuzhishan,have similar morphology,but those in Nanling grow faster.