Abstract: The eco-efficiency of land use reflects the ecological impacts produced by economic activities of land use, which is a critical factor to monitor economic development and to achieve the control of ecological cost. On the basis of defining the connotation of the eco-efficiency of land use, we examined the efficiency situation, spatial differentiation, availability of resource allocation and output efficiency of 31 provincial administrative units in China in 2005, 2010, and 2015, based on C₂R model of data envelopment analysis, spatial statistics analysis and grey target model. The results showed that the eco-efficiency of land use was generally low except Tibet Autonomous Region. The spatial distribution was basically high in the west and north and low in the east and south. There was a significant spatial autocorrelation of eco-efficiency of land use at the provincial level, with an obvious change in partial places. The northwestern part had high-high cluster, and a lowlow cluster was mainly distributed in southeast coasts of Guangdong and Fujian. The availability of resource allocation in the east part was lower than that in the west part, indicating an obvious input surplus in the east part. The output efficiency was significantlyincreased in China from 2005 to 2015, and the regions with low values were clustered to the radiating regions of BeijingTianjin-Hebei, Yangtze River Delta and Pearl River Delta as cores.

Key words: Weibei dryland, optimal N application rate, winter wheat, yield, environmental benefit