Abstract: This paper describes a new species of the genus Sinocyclocheilus Fang 1936,collected from the cave in Libo County,Guizhou China.Sinocyclocheilus hugeibarbus,Li,et Ran,sp,nov (Fig.1)Holotype No.200210005,total length 258　mm,standard length 207　mm,collected in autumn 2002 from a cave of Libo County (25°20′N，107°41′E  altitude 790　m)   in Guizhou Province.Paratype 4 specimens No.200210001～004,Total length 237～256 mm,standard length 187～217　mm,collected with the holotype.Description:D.ⅲ.7;A.ⅱ,5;p.ⅰ,14;V.ⅰ.8;Branched caudal fin rays 17.Lateral lin scales 66(28～31)/(14～16-V)71.Gill-rakers 2+4～6.Pharyngeal teeth 3 rows 2，3，4/4，3，2.Body depth in standard length 2.58～2.72(2.64).Head length 3.18～3.98(3.90),length of caudal peduncle 4.09～4.92(4.55).Depth of caudal peduncle 6.89～7.75(7.15).Snout in head 2.58～2.77(2.68),eye 8.17～12.00(10.42),interorbital 3.27～4.04(3.50).Depth of caudal Peduncle 1.50～1.71(1.58) in its length.Diagnasis: The new species is similar to S.altishoulderus Li et Lan (1992),but differs from the latter in:lateral line scales 66(28～31)/(14～16-V)71;Vs 54（14 17）/（～11-V）58;barbel huge and thick;body depth in standard length 2.58～2.27(2.64);Vs 2.90～3.30;interorbital 3.27～4.07 (3.50) in head;Vs 4.70～5.80(5.30),ect,Tab.1.

Key words: new species, cave adaptation, Sinocyclocheilus, Guizhou