Owing to the various situation

the conversion of farmland(back to forest or grassland) in foreign countries has various objectives

such as alleviating social contradiction

eliminating grain overstock

conserving biodiversity

reconstructing landscape

mitigating greenhouse effect

etc. Proceeding from analysis of the farmland's conversion abroad

we can make a conclusion that economic strength is the basis of this kind of farmland's conversion

the surplus of grain is the pledge and the shift of labor to towns or cities is the precondition. Furthermore

the success of the farmland's conversion benefits from the changes of revenue policies to a great extend. To put the Farmland's Conversion Project into effect in China

taking the experience of other countries and considering of China's specific situation

this research proposes two advises: on the one hand

the economic construction and grain production must be strengthened; on the other hand

the living of the farmers who convert their own cultivated land back to forest or grassland should be well arranged. The government may carry out a series of preferential policies about revenue and credit etc. to make those farmers live better.