Scanning electron microscope was used to examine the microdermatoglyphic structures of the dorsal scales of eight species of colubridae snakes, which were collected from Yunnan Province (Table 1). Species are Brown netted keelbacks(Hebius johannis), Khasi keelbacks(Hebius khasiensis),Eight lined keelbacks(Hebius octolineatum), Boulenger’s Keelbacks(Hebius parallelum), Bhamo Tree Snakes(Dendrelaphis subocularis), Big-eyed Mountain Keelbacks(Pseudoxenodon macrops), Tiger groove-necked keelbacks(Rhabdophis tigrinus), and Chinese Kukri Snakes(Oligodon chinensis), all the specimens preserved in the zoological museum of Southwest Forestry University. We chose one individual for each species and examined 3 dorsal scales at neck, back, and rear respectively. Totally, five kinds of microstructures were found on the scales that were keel, longitudinal ridge, thin ridge, vertical stripe, and pore. The characteristics of these microstructures varied among these species (Table 2). Six species had keeled scales, but not on Bhamo Tree Snake and Chinese Kukri Snake. The longitudinal ridge was longer than 100 ?m on 7 speciess, but shorter than 100 ?m on Big-eyed Mountain Keelback. The thin ridge was only found on Bhamo Tree Snake and Boulenger’s Keelback. The vertical stripe showed U-shape on 7 snakes but was wave-shape on Bhamo Tree Snake. The position and structure of the pores differed significantly among these species, but more densely distributed on Bhamo Tree Snake, Big-eyed Mountain Keelback, and Tiger groove-necked keel-back. The microdermatoglyphic structures of Bhamo Tree Snake were the most complex (Fig. 1) that might due to the humid tropical rainforest they lived in.