Abstract: In June,2002,3 specimens were collected in Nanshe River,a branch of Honghe River,in Hekou County of Yunnan.All of 3 specimens were measured and described,these specimens were identified as Sinogastromyzon chapaensis and kept in Department of Life Science,National Tsing Hua University (Taiwan).Description of measurements is as below:35-50 mm in standard length,dorsal fin rays iii,8;anal fin rays ii,5;pectoral fin rays xiv-xv,14-16;pelvic fin rays x-xi,11-12;lateral line scales 60-64.Body depth is 7.0-7.2 times in standard length,body width 4.3-4.6 times,head length 4.9-5.1 times,caudal length 5.4-6.0 times,caudal depth 12.7-14.0 times,predorsal fin length 2.2 times and prepelvic fin length 2.4-2.7 times.Head depth is 1.8-1.9 times in head length,head width 0.9-1.1 times,snout length 2.0-2.1 times,vertical diameter of eye 4.7-5.0 times and interorbital width 2.0-2.3 times.Caudal depth is 2.2-2.6 times in caudal length.Mouth width is 3.7-4.6 times in head width.