According to the classification system of Zhang et al. (2000), thefishes of Labeoninae was divided into three groups based on the morphology of oromandibular structures. The second group is recognized by following characters: rostral cap completely covers the upper jaw and upper lip; the upper lip is highly retrogressed and concealed between rostral cap and upper jaw; the lower lip has complicated structure and some of genera have lower lip which almost develops into a sucking disc. During examination of Labeoninae specimens from Guangxi Province deposited in Kunming Institute of Zoology, some specimens from Dabu Village , Guilin City, Guangxi could not assign to any genus of Labeoninae. Herein we established a new genus for them – Stenorhinchus. According to the morphology of oromandibular structures, Stenorhinchus belongs to the second group of Labeoninae. The present paper focuses to study the phylogenetic relationship of Stenorhinchus within genera of the second group of the subfamily Labeoninae. Zhang (1998) thought that Parasinilabeo had closer phylogenetic relationship with Semilabeo and Pseudogyrincheilus. Su (2001) suggest that Parasinlabeo, Rectoris, Sinocrossocheilus formed a monophyletic group. The paper is to verify if Parasinilabeo has closer relationship with Semilabeo and Pseudogyrincheilus. Meanwhile a new species Parasinilabeo longiventralis was described. According to osteological and morphological characters, genera belonging to the second group of Labeoninae subfamily (Rectoris, Crossocheilus, Akrokolioplax, Sinocrossocheilus, Pseudocrossocheilus, Parasinilabeo, Semilabeo, Pseudogyrinocheilus) and Bangana lippa, Lobocheilus melanotaenia, Cirrhinus lolitorella were chosen as the ingroup. Spinibarbus caldwelli and Hypsibarbus vernayi were chosen as the outgroup. Through outgroup comparison, 61 osteological and external characters were chosen and coded into a data matrix. Then MacClade4.0 and Paup 4.0 were used for analysis. On the basis of the data matrix, the phylogenetic tree was reconstructed. By the phylogentic analyses, the following conclusions and suggestions were drawn: 1. The second group of Labeoninae is a monophyletic group, herein named them as Crossocheilus-group. 2 Stenorhinchus is closer phylogenetically to Semilabeo and Pseudogyrincheilus and should belong to the second group of Labeoninae Sunfamily. 3. Parasinilabeo is sister group of Stenorhinchus, Semilabeo and Pseudogyrincheilus. 4. Sinocrossocheilus is not a monophyletic group. 5. The taxonomic relationship of Rectoris and Sinocrossocheilus labiata within subfamily Labeoninae was not resolved and needs to be testified by further molecular research.