Abstract: On the basis of analysing 34 forest ecological factors about climate, soil, landforms and. geology, 42 forest ecological counties are classified with cluster analysis and principal component analysis (PCA) and the reliability of 5 alternative of classification are examined with the method of discriminant analysis. With the aid of said numerical classification, 42 forest ecological counties of Jilin Province has merged into five forest ecological districts.Brief description of each district is given which will provide scientific basis for the conservancy and administration of forest ecological system.