黑叶猴是栖息于喀斯特石山地区的珍稀濒危灵长类动物，由于非法捕杀和栖息地丧失，种群数量急剧减少。2017年10-12月，我们采用样方法调查恩城国家级自然保护区及其周边地区黑叶猴的种群分布、数量及保护现状，分析其致危因素，为制定有效管理行动计划提供理论依据。本次调查共记录到黑叶猴夜宿地89处，其中有43处夜宿地下方有新鲜排泄物。结合本次调查和访问，确定黑叶猴的种群数量为18群100~105只，包括1只全白化黑叶猴成年雌性个体；其中11群分布在保护区内，7群分布在保护区外。猴群由3~12只个体组成。栖息地破碎化和退化是威胁恩城保护区黑叶猴种群生存的主要因素。

François’ langur (Trachypithecus francoisi) is a rare and endangered primate species, restricted to habitats characterized by karst topography. As a result of illegal hunting and habitat loss, populations of this species have decreased dramatically. From October to December 2017, we conducted a survey on the population status and distribution of Fran?ois’s langurs in Encheng National Nature Reserve (NNR) using partition-spot surveys. We evaluated the conservation status and threat factors, which are needed for developing conservation strategies. Overall, we found 89 sleeping sites, including 43 sites with fresh feces. Combining this survey and interviews with local people, we detected 18 groups, with an estimated total population of 100-105 individuals, including one albino adult female. There were 11 groups within the reserve, and 7 groups outside the reserve; group size ranged from 3 to 12 individuals. The primary threats are habitat fragmentation and degradation in Encheng NNR, which must be mitigated to ensure the survival of this imperiled species.