Abstract: Using the PSR model, 21 indicators were selected from the three aspects of stress, status, and response to build a Chongqing sustainable land use evaluation index system, and the level of sustainable land use in Chongqing was evaluated and analyzed from 2007 to 2016; a coordination index was introduced to evaluate the coordination of sustainable land use system; the obstacle degree model is used to diagnose the main obstacle factors that restrict the sustainable use of land. The results show that the overall level of sustainable land use in Chongqing showed a rising trend from 2007 to 2016, and the comprehensive index rose from 0.393 to 0.693, which experienced a low-medium-high development process. The pressure index generally showed a rising trend, with an increase of 1.59%. After a sharp rise, the state index declined slightly, and finally rose slowly, with an increase of 3.93%. The response index showed a steady and slowly rising trend, with an increase of 1.8%. From 2007 to 2016, the coordination of Chongqing's sustainable land use system has been at a high level, and the coordination index and the comprehensive index of sustainable land use level have generally shown the trend of "simultaneous increasing and decreasing". The obstacle degree of system pressure has gone through three stages of rising-declining-rising, and generally shows an upward trend; the obstacle degree of the system state shows a trend of rising first and then decreases; the obstacle degree of system response generally shows a downward trend. The main obstacle factors affecting the sustainable use of land in Chongqing include per capita arable land area, land multiple cropping index, fertilization level, average land GDP, and forest coverage. In order to promote the continuous improvement of the land use level in Chongqing, it is necessary to reduce the excessive consumption of land resources by economic growth and increase the intensive use of land. At the same time, it should increase land remediation and environmental governance, and continue to increase investment in ecological environmental protection, so as to improve land quality and improve the quality of the ecological environment.

Key words: sustainable land use, PSR model, coordination, obstacle model, Chongqing