Agriculture has both economic value and non-economic value. The calculation of the non-economic value of agriculture has become a research hotspot in academic circles. This paper divides the value of agriculture into products production value and ecological value, and adopts an authoritative ecological value calculation idea, i.e. the method proposed by Costanza et al. in 1997 as the basis to calculate the ecological value of agriculture. However, the study has come under heavy criticism:for example, some data have major deviation, underestimating the ecological value of cultivated land while overestimating the wetland. XIE Gaodi et al. in 2003 came up with more reliable results to make up for the deifciency of the methods from Costanza et al. Referring to some of the results and on the basis of a questionnaire survey to 200 Chinese ecologists, this paper presented an equivalent factor table for evaluating the ecological service value (ESV) of China’s ecosystem. Based on this table and the practical situation of Tianjin, the paper formulates an applicable calculation method for ecological value and actual y calculates the ecological value of agriculture in Tianjin with ofifcial statistics. The results show that the actual value of the ecological value of agriculture in Tianjin in 2012 was 111.20 bil ion CNY, about triple of the economic value of agriculture (37.56 bil ion CNY) in the same year.%农业不仅具有经济价值，同时还具有非经济价值，而估算农业的非经济价值成为学术界研究的热点。本文把农业的价值分为生产产品价值和生态价值，并采用具有权威性的生态价值测算思想，即Costanza等于1997年提出的方法作为估算农业生态价值的方法依据，同时，由于该项研究也受到了不少严厉的批评，如由于某些数据存在着较大偏差，导致对耕地生态价值的估计过低，对湿地的生态价值估计又偏高等。因此，进一步借鉴谢高地等于2003年针对Costanza等的不足，在参考其可靠的部分成果的同时，基于对我国200位生态学者的问卷调查，制定出我国生态系统生态服务价值的当量因子表。以此表为基础，结合天津市实际形成适用的生态价值测算方法，采用官方统计数据实际测算了天津市农业生态价值。结果发现2012年天津市农业生态价值的现实值为1112.01亿元，是当年农业经济价值375.60亿元的3倍。
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