The paper researches the decoupling relation between China's crop production and chemical fertilizer consumption from 1998 to 2012 through the related theory and measuring model on"decoupling"and"coupling".Meanwhile,a decoupling-index decomposition model is constructed to extend the decoupling model,and the factors behind decoupling relationship is analyzed.The results show that:the relation between horticultural crop yields and chemical fertilizer consumption over the past 20 years belongs to strong decoupling while others belong to weak decoupling.Furthermore,it can be concluded that the increase of fertilizer use efficiency plays an important role in improving the decoupling degree between China's crop production and chem-ical fertilizer consumption while structure changes are of a minor effect.
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