Abstract:The basic conditions of more than 20 famous forestry ecological projects in the world are introduced, and among them, the 11 important projects are analyzed on scale, scope, investment, period and start\|up time (means the period from initiation to now) in single factor and multi\|factors using Analytic Hierarchy Process (AHP). The results using AHP shows that the 10 largest forest ecological projects in the world are: Chinese Three\|north and Middle and Lower Reaches of the Yangtze River Shelter\|belt Fo...