During two years 2011 and 2012, the surveys on the Avifauna in the natural ecosystem of the mountain area of Chi Linh town, Hai Duong province were carried out. A total of 147 bird species belonging to 50 families, 16 orders were recorded in the survey area. Among 147 bird species recorded, there are two species were listed in the Red Data Book of Viet Nam (2007), two species well listed in the IUCN's Red List (2010) and eight species were listed in the Governmental Decree 3212006/ND-CP.