Abstract: This paper describes a new species of the genus Sinocyclocheilus Fang 1936,collected from the cave Shadong in Lingyun County,Guangxi,China. Holotype No.990418004,total length 137 mm,standard length 110 mm,collected on April 18,1999 from Shadong of Lingyun County (24°20′N,106°32′E,altitude 470 m) in Guangxi Province.Paratype 12 specimens No.990418002-03,990418005-08,990420001-02,990422001-04.Total length 84-174 mm,standard length 64-137 mm,collected with the holotype. Description:D.iii,7;P.I,11-13;V.I,7-8;A.iii 5;Branched caudal fin rays 16.Lateral lin scales 71-78.Gill-rakers 2+7-8.Pharyngeal teeth 3 rows 2.3.5/5.3.2.Body depth in standard length 2.97-3.55(3.18),head length 3.44-4.03(3.73),length of caudal peduncle 4.06-5.33(4.85),depth of caudal peduncle 6.60-8.00(7.25).Snout in head 2.42-3.00(2.74),eye 6.00-11.33(8.46),interorbital 2.42-3.00(2.80).Depth of caudal peduncle 1.30-1.60(1.46) in its length. Diagnosis:The new species is similar to S.jii Zhang et Dai 1992,but differs from the latter in:1)lateral line scales 71/14-17/8-11-Ⅴ/78;Vs 48/22-24/17-19-Ⅴ/50:2)harnen and serrated of last unbranched drosal ray;Vs smooth,slender and soft:3)barbel long and sturdy.4)eye in head 6.00-11.33(8.46);Vs 6.6. All type specimens are kept in Heilongtan Reservoir of Shilin County,Yunnan Province,and the Department of Biology of Yunnan University.