According to forest resources inventory of the Tenth Five-year Plan in and by taking Xishan Forest Farm of Beijing City as an example, a rapid assessment indicator system of forest ecosystem health is established based on the integrality indicator, stability indicator, and sustainability indicator. Indicator weight is determined by applying the method of AHP. By using forest health assessment model, the health assessment in Xishan Forest Farm at subplot scale is studied. Results show that there are 367 subplots in Xishan For est Farm and 70. 3% of them are in sub-health condit ion. The eight indexes determined can reflect the forest ecosystem health statement of Xishan Fo rest Farm and they are easy to use, with a certain degree of science and operation.