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Grain for Green Project is the largest investment in China, of the most extensive, the most complex processes of ecological engineering. Effective monitoring and evaluation of the Grain for Green Project is a community pay close attention to the problem. In this paper, Chengde County, Hebei Province, returning farmland to forest situation of the object of study in the overview of the current state of affairs at home and abroad Land Conversion Project Evaluation Index System and Research based on a lot of basic work experience and practice of the past, scientists relying on a combination of field surveys and statistics, a combination of qualitative and quantitative analysis, the combination of science and technology and production practices approach, respectively Chengde County Grain for Green Project of ecological benefits, economic and social benefits of a number of indicators systematic research. The results show that: eco-efficiency, ① to the end of 2007, Chengde County implementation of returning farmland to forest area reached 177,400 hm ~~ 2. Forest coverage increased from 40% in 2002 to 55% in 2007, an increase of 10%; Abandoned also Lin Engineering accumulated water conservation 12554.67m3 total economic value of 6.2773 million; gradually reduce soil erosion modulus Abandoned 3521.2 t / km to 2 · a down to 2007 1594.7 t / km to 2 · a reducing 1926.5 t / km ~ 2 · a, decreasing the average annual rate of 9.11%. (2) By the end of 2007, the cumulative amount of solid earth 1042829.33 t, the total value of the solid earth economic 521.4147 million; total organic matter 8238.35t reserved, the full N1793.67t, P1074.11t, K2377.65t, fertilizer conservation of total economic value of 5653.2289 million, total solid FERTILITY PRESERVATION the effectiveness of the economic value of 6174.6436 million. ③ cumulative fixed CO2 245282.4 t, the release of O2 179071.2 t. Returning farmland to forests to achieve carbon fixation and oxygen-effective total value of 255,046,460 yuan. ④ cumulative absorb SO2 8924.96 t, achieve economic gains 535.4976 million yuan; accumulated dust - 1270720.07 t create economic value 21602.2412 million. Chengde County farmland since achieve the air purification economic value 21602.2412 million. Economic benefits ① Chengde County Grain for Green Project caused by the substantial reduction of the cultivated area, total grain output rising trend overall, and with the returning farmland to forests to increase the effect of the number of years more and more significant. ② industry revenue structure change, agriculture, forestry, animal husbandry and fishery income increased steadily and rapidly from 997.9 million yuan in 2002 to the end of 2007, 1,985,920,000 yuan, an average annual growth rate of over 16%; other industry and agriculture synchronization growth, especially in the transport sector and catering income improved significantly. ③ industry revenue structure changes, the decline in the proportion of primary industry and the tertiary industry in the total output value, respectively, from 26% in 2002, 31% to 23% at the end of 2007, 25%, while the secondary industry increase the ratio of the output value rose to 51% from 43% at the beginning of the Abandoned. Social benefits (1) implementation of Chengde County, returning farmland to forests in seven years, the farmers on crop acreage adjustments rice acreage and oilseeds acreage is declining corn acreage has expanded each year with the deepening of the Grain for Green Project presentation trend, soybean acreage has also experienced a dramatic decline - slow down - the gradual increase in the change process, vegetables acreage determined no significant changes in trends. ② Chengde County Abandoned labor metastasis, the primary industry population decline, the secondary industry employed population fluctuations, increases and decreases, identify trends, the working population of the tertiary industry increased significantly, from 0.74 million in 2002 to 2004 annual maximum of 1.77 million people. In this study, scientific, objective evaluation indicators and evaluation methods for the returning farmland effectiveness evaluation, the results will be the future of Grain for Green Project scientific decision-making and the smooth implementation of important theoretical value and practical significance.
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