Abstract: The services of the forest ecosystem were categorized into supporting，provisioning，regulating and cultural supporting services，by referencing to the domestic research achievements and combined with the specific situation in Tianbaoyan National Nature Reserve. In this thesis，the emergetic monetary value of services provided by the Tianbaoyan forest ecosystem were evaluated based on theory of emergy analysis The results revealed that: The total emergy of these services was 322×1020sej annually，including 144×1019sej for supporting，100×1020sej for provisioning, 193×1020sej for regulating, and 144×1019sej for cultural supporting services. The total monetary value of emergy with these services was ￥29600 million annually, among which￥1320 million for supporting, ￥9200 million for provisioning, ￥17700 million for regulating, and￥1320 million for cultural supporting services. The emergy monetary value with these services was in the order of air purification>raw material>soil and water conservation>carbon fixation and oxygen release>water conservation>research services>organic matter production>nutrient storage and cycling> ecotourism. The emergy of service with biological genetic information was 443 × 1021sej annually，and the monetary value of it was￥40700 million annually.