The paper took forest in Poyang Lake region for case to study the suitability evaluation by introducing the Niche-fitness theory and Kriging method. The weight average model was used to quantitative analysis the niche-fitnesa and restrictive factors for growth of Camellia oleifera and Cunninghamia lanceolata. The results show that the niche-fitness value in the region is in medium and the suitability for growth of economy forests is strong. The ratio of land suitability in grade 1 and 2 for Camellia ohifera planting to forest land is account for 79.51% , grade 2 and 3 for Cunninghamia lanceolata account for 70. 07% . In terms of comprehensive suitability evaluation result, Camellia oleifera suitable area ranks first with the ratio amounting to 71. 23 % . Total phosphorus and organic matter content are the primary limited factors to restrict the economic forest growth in the region. The results can apply to guide economic forestry production, to promote the forest land reasonable utilization and management.
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