Abstract: From the view of the characteristic of frangibility evaluation of economic,ecological and social multiple system,this article establishes evaluation indexes system and constructs frangibility evaluation model of forestry system based on factor analysis method.This article collects statistical data of forestry area from 1998 to 2006 year for empirical research,carries out in-depth analysis on propulsive disciplinarian and economic connotation of four communal factors and one synthetical factor.The evaluation system emphasizes that evaluation indexes are accurate,statistical data can be acquired and evaluation method is scientific and practical.The essential innovation of this article is to establish a scientific quantificational analytical method for the frangibility evaluation of forestry system in order to provide dependable referenced information for the programming and adjustive strategy of forestry system.

Key words: forestry system, frangibility evaluation, factor analysis method, empirical research