We surveyed the habitat structure of Black crested gibbons (Nomascus concolor
) in Pinghe, Ailao Mountains, Yunnan Province (E 101°17'16.1", N 24°20'09.5", Alt 2 600 m) using a quadrat method. This survey recorded 57 tree species from 37 genera and 24 families and nine woody liana species from eight genera and six families. The dominant families are Ericaceae, Magnoliaceae, Theaceae and Fagaceae. After ranking the importance values of the major species, we found that Rhododendron irroratum
, the dominant species of the region, is distributed in various slope positions. The arbor's diversity and evenness index decreased significantly in the ditch. The proportion of canopy Layer I and II, as well as the abundance of the woody vine, increased from the summit to the ditch. Compared with other populations black crested gibbons in Ailao Mountains act at a relatively low level above the ground (10-22 m) and have less fleshy fruit species for eating.