Abstract: Based on the principles and methods of ecological green equivalent, firstly, the scores of ecological service functions of different land use/cover types were designed. Secondly, the equivalent values of land use change were estimated. On which an assessment model was framed to assess the eco-efficiency of land use in the Manas River Basin. The results showed that the net enlargement of ecological equivalent area was 150.71 km² in the Manas River Basin in recent 30 years, and there was an enlargement trend in a slight fluctuation way. The enlarged areas of farmland and waters were the largest, they were 456.63 km² and 181.7 km² accounted for 29.25% and 77.32% of the equivalent area in 2013, respectively. The reduction of natural grassland, unused land and wasteland was obvious, and their equivalent areas were reduced by 129.12 km², 132.98 km² and 230.36 km² and accounted for 29.48%, 11.32% and 17.49% of the equivalent area in 2013, respectively. The eco-efficiency of landscape was increased by land management, but the land reclamation and grassland degradation resulted in a fragile balance.

Key words: green equivalent, land use, eco-efficiency, the Manas River Basin, Xinjiang