Tam Dao mountain ridge extends from the northwest to the south-east for 80 km within the limits of Vinh Phu and Bac Thai Provinces. Diversity of the fauna of snakes of this mountain ridge is very high. Rene Bourret (1934, 1935, 1936) made first and important contribution to the knowledges on the fauna of snakes of Tam Dao. In our paper we present the results of own long-term field work in this area (1987 – 2000). During description of distribution and analysis of taxonomic status and nomenclature were used the main books and papers that characterized the fauna of snakes of this region (Bourret, 1934, 1935, 1936; Smith, 1943; Inger and Marx, 1965; Taylor, 1965; Campden-Main, 1970; Deuve, 1970; Saint Girons, 1972; Hoge and Romano-Hoge, 1981; Mahendra, 1984; Ota, 1988; Golay et al., 1993., Vogel, 1994; Orlov, 1995, 1997; David and Vogel 1996; Nguen Van Sang and Ho Thu Cuc, 1996; Schultz, 1996; Zhao and Adler 1993; Zhao 1997; Zhao et al., 1998; David and Ineich, 1999; McDiarmid et al., 1999; Ziegler and Vogel, 1999).