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To build the artificial forest ecoaystem is the major eco-economic development model in the watershed of Miyun Reservoir.It is very important to evaluate the benefits of those ecosystems.Emergy theories are very helpful for us to establish a science-based assessment framework.Emergy evatuation of the artificial forest ecosystems in the watershed of Miyun Reservoir is used to asses the relative values of several ecological hinctions (sometimes called ecosystem services)and main ecosystem storages(sometimes called natural capital).The main driving energtes,intal processes and storages are evaluated.The main functions,including transpiration,GPP and infiltration,are evaluated,which are 609em$/ha/yr,6,245em$/ha/yr and 340em$/ha/yr respectively.The total values of major environmental services are 4,683em$/ha/yr in the artificial forest ecosystem.The main storages of natural capital including live biomass,soil moisture,organic matter,underground water and landform are estimated,which are 112,028em$/ha,9em$/ha,40,718em$/ha,34em$/ha and 6,400.514em$/ha respectively.The largest value is landform,which accounts for97.7%of these calculated total emdollar values.The concept of replacement value is explored using the emergy values of both ecosystem services and natural capital.The total calculated replacement values are 302,160em$/ha.