High quality habitat is generally considered an essential factor for the survival and reproduction of wildlife. Changes in habitat quality have significant impacts on wildlife. Therefore, there is a need for an objective and quantitative method that can be used to investigate the dynamics of wildlife habitat change. As a globally recognized endangered species, the Golden snub-nosed monkey (Rhinopithecus roxellana) has become one of the animals under first-class state protection in China. However, habitat loss and fragmentation, caused by anthropogenic activities and climate change, has seriously affected the habitats of the Golden snub-nosed monkey. An effective assessment system for its habitat dynamics will improve effective conservation management. The traditional field survey for evaluating habitat quality is a time-consuming method. However, the rapid development of 3S techniques and the application of 3S integration have improved the study of the spatiotemporal dynamics of the Golden snub-nosed monkey habitat pattern. The Baihe Nature Reserve in the Minshan Mountains was used to measure the spatiotemporal variations in the Golden snub-nosed monkey's habitat pattern. A series of optimal Landsat MSS/TM/OLI remotely sensed images for 1975-2014 were collected. Then a decision tree classification was employed to acquire land cover maps based on expert knowledge. In addition, spatial canopy coverage maps were derived from a linear correlation model between the Normalized Difference Vegetation Index (NDVI) and measured canopy coverage. The life habit of the Golden snub-nosed monkey was obtained by analyzing field data collected from April 2011 to April 2012 and during the whole of 2013 using mathematical statistics and spatial analysis methods, which formed the basis for evaluating the habitat. Finally, an effective habitat assessment system for the Golden snub-nosed monkey was constructed using the Analytic Hierarchy Process (AHP) method to quantitatively analyze the dynamics and trends of the habitat pattern over the past 40 years. The results indicated that the habitat in the Baihe Nature Reserve changed from good quality to deteriorated status, and then gradually recovered. Both the most suitable and suitable habitat areas decreased initially and then increased gradually, while the relatively suitable and unsuitable habitat areas showed the opposite trend. From 1975 to 1982, all habitats varied significantly, especially for the most suitable and unsuitable habitats, and the total habitat qualities considerably declined. From 1982 to 1994,the habitat quality improved and this trend continued between 1994 and 2003, but from 2003 to 2014, total habitat quality stabilized. Climate change and human disturbance are two critical factors responsible for the habitat dynamics in the study area. To some extent, the habitat change in the 1980s was related to climate change, whereas human disturbance became increasingly evident after the 1990s. This study will improve understanding about the response to spatial and temporal variations in the Golden snub-nosed monkey's habitat caused by increasing climate change and human disturbance. This research also provides scientific support to the management and conservation of these endangered wild animals.