The ecological effects of the project of conversion of cropland to forest of Gansu Province was assessed with the distributed measurement method . The results show that the total ecological effects value of the project of conversion of cropland to forest of Gansu Province is 84.894 billion yuan annually . The total ecological effects value of the project of conversion of cropland to forest of Gansu Province in 2013 is far more than the total investment from 1999 to 2015 . The order of the ecological effects value of 6 ecological services from large to small is water conservation , soil conservation , carbon fixation and oxygen released , biodiversity protection , atmosphere environmental purification , nutrient accumulation . The order of the ecological effects value of different cities of prefectures is Pingliang , Qingyang , Longnan , Tianshui , Dingxi , Baiyin , Linxia , Zhangye , Lanzhou , Jiuquan , Wuwei , Gannan , Jinchang and Jiayuguan . Evaluation results truly reflect achievement of the project of conversion of cropland to forest of Gansu Province , w hich show that the project of conversion of cropland to forest of Gansu Province has obtained the good ecological effects .%基于分布式测算方法，对甘肃省退耕还林工程的生态效益进行了评估．结果表明，截至2013年，甘肃省退耕还林工程的生态效益总价值量为848.94亿元·a－1，相当于工程自实施到2015年的总投资．6项功能的价值量由大到小的顺序为涵养水源、保育土壤、固碳释氧、生物多样性保护、净化大气环境和营养物质积累．各市（州）生态效益价值量排序为平凉市＞庆阳市＞陇南市＞天水市＞定西市＞白银市＞临夏州＞张掖市＞兰州市＞酒泉市＞武威市＞甘南州＞金昌市＞嘉峪关市．说明甘肃省退耕还林工程取得了较好的生态效益，评估结果真实地反映出甘肃省退耕还林工程所取得的成果．
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