The flora of Qian Mountain in Liaodong peninsula was compared the adjacent mountains including Changbai Mountain, Wutai Mountain, Xiaowutai Mountain, Tai Mountain, Culai Mountain, Kuyu Mountain and Lu Mountain using similarity coefficients at genus and species levels and clustering analysis. Qian Mountain flora is much closer to Xiaowutai Mountain and Wutai Mountain than.Kunyu Mountain, Tai Mountain and Culai Mountain, whereas it is distant with Lu Mountain. The present data indicate that Qian Mountain should belong to the North China flora. The classification of Liaodong peninsula flora is discussed.