The Leaf Warblers (Phylloscopus) is a group of small insectivorous birds which widely distributed in the Old World. Currently 66 species are recognized in the world, and around 50 species of this group can be found in Asia. Due to very similar external morphology and sympatrical distribution of some close related species, the taxonomy of leaf warblers has been a longstanding challenge, a difficult problem and a hot topic to the avian taxonomists. In 2003, Dr. Jia Chen-Xi et al. reviewed the taxonomical status changes of leaf warblers since 1990s’, including 3 newly described species and 9 species elevated from subspecies to species rank; this sums up of 30 species and 26 subspecies. Since 2003, taxonomic and systematic research on Phylloscopus yielded many new achievements. A combined literature and additional distribution information survey, a review of taxonomic progress related to the leaf warblers in China in the past decade is presented here. For instances, Prof. Martens and his colleagues have described the West China Leaf Warbler (P.occisinensis) from western China in 2008, which is closely related to the Tickell’s Leaf Warbler (P.affinis). Dr. Alström and his colleagues have described the Limestone Leaf Warbler (P.calciatilis) from the Vietnam and Laos karst area in 2010. This novelty proved to occur in southwestern Guangxi Province, China. Besides these newly described taxa, the Japanese Leaf Warbler (P.xanthodryas) has been split from the Arctic Warbler (P.borealis), as well as the La Touche’s Leaf Warbler (P.claudiae) has been split from the Blyth’s Leaf Warbler (P.reguloides) etc. Taxonomic status re-evaluations were also proposed, such as the Grey-headed Warbler (Seicercus xanthoschistos) turned out to be member of the genus Phylloscopus. The record of the Willow Warbler (P.trochilus) in the Dalinor National Nature Reserve, Inner Mongolia adds new distribution information to this uncommon species in China. According to these new taxonomic recommendations, we count 41 species and 31 subspecies of the genus Phylloscopus in China. The ongoing taxonomy research on the leaf warblers clearly shows a trend of integration of the traditional morphology with modern molecular genetics, vocalization analysis and field playback experiments, which enabled researchers to solve many longstanding systematic uncertainties through different chains of evidence. China holds the most species of the genus Phylloscopus in the world, with six species breeding only within China plus three endemics. However, only few publications or research projects on Phylloscopus have been carried out solely by Chinese ornithologists. Undoubtedly the leaf warblers have very important research potential in systematics and evolutionary biology and related fields. Chinese ornithologists should pay sufficient attention to these birds and concern them as major research projects.