退耕还林（草）工程的经济效应关系到人工重构生态系统的稳定性，研究退耕区农村经济的发展情况，对科学评价退耕还林（草）工程经济效应具有十分重要的意义；本研究以安塞县退耕还林(草)试点工作为对象，采用参与性农村评估(Participatory Rural Appraisal， PRA)为调查方法，对安塞县实行退耕还林工程以来农村经济效应的变化情况进行调查；采用主成分析法对6个经济指标与退耕还林（草）经济效应的关系进行分析；用聚类分析法对8个模式的经济效应进行分类。主成分分析结果表明：6个经济效应指标可以简化为特色农业收入因子、粮食收入因子和非农业收入因子，并对各因子对经济效应的贡献作了详细分析。聚类分析结果表明：8个退耕模式可分成4个经济效应发展类型：经济效应增效型、经济效应稳步型、经济效应迟缓型和经济效应滞后型；从而进一步验证经济效应与农业结构调整、后续产业的发展、剩余劳动力转移的关系，为退耕还林(草)的顺利开展提供研究依据。
Economical effect of Project of “Returning Farmland to Forest and Grassland” was related to stability of man-made ecological systems. It was very important to research the development condition of rural economy in areas of Grain for Green for scientific evaluation economical effect of the Project; A case study of Ansai County, a survey was carried out on change of rural economic effect after put in practice the Project though Participatory Rural Appraisal (PRA); The relationship between Economical effect of the Project and 6 economic indicators was analyzed by principal components analytic method; economical effects of 8 patterns were classified by cluster analytic method. The results of principal components analyzed indicate that 6 economical effect targets can simplify as the characteristic agriculture income factor, the grain income factor and the non-agricultural income factor, and it analyzes the detail of contribution of various factors to the economical effect. With the clustering analysis divided 8 patterns of take back from agriculture into 4 economical effect development types: synergize, level off, slow and detain. The research further confirms the relationship among the economical effect, the agricultural structure adjustment, the following industrial development and the surplus-labor shift, provides study basis for successfully development of the project.