Ba Be was officially recognized as the 1938th Ramsar of the world on 02/02/2011 and became Vietnam's third Ramsar in 2012 (Ba Be National Park). The fauna of the park is very rich with 81 species of mammals, 27 reptiles, 17 amphibians, 322 species of birds, 106 species offish, 553 species of insects and spiders (the Ministry of Science and Technology, 2007). There are many rare and precious species recorded by Viet nam and international Red Book, of which the Trachypithecus francoisi is on the edge of high danger. The research applied GIS technology to identify the habitat, which is becoming shinking of Trachypithecus francoisi. From the research result, it is necessary to have solution to protect and matain those kinds of endangered primates in the future. Besides that it should satisfy both the benefits of local community and long-term benefits of national and international as well as future generation.