Abstract: With the Saihanwula Forest Ecosystem Research Station location as the study area and on the basis of the field survey and observation and the “forest ecosystem service function evaluation standards”the evaluation index system was developed. Evaluation on the values of the Betula platyphylla forest ecosystem services of different ages in Saihanwula was carried out.The results show that in 2012,the Betula platyphylla forest water conservation,soil conservation,carbon sequestration and oxygen emancipation,accumulation of nutrients,air environment purification and biodiversity conservation of ecosystem service produce a value at 9.72×10⁸ yuan/a.The highest value is soil conservation function.The space distribution state of southern Daxinganling Betula platyphylla natural forest ecosystem service value was as follows:near mature forest >mid-mature forest> young growth> mature forest> overmature forest.Evaluation of the ecosystem service values of the Betula platyphylla forest of different age groups will benefit the research of forest ecosystem service function of a single tree species in southern Daxinganling.

Key words: southern Daxinganling, Saihanwula, the Betula platyphylla forest, ecosystem services value, evaluation