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This paper quantifies urban land use eco-efficiency (ULUEE) and explores its improvement in the context of western China. We propose a hybrid model that includes the Super-slack-based measure model (Super-SBM) and a varying co-efficient panel model using data from 11 provincial cities in the western regions of China from 2000 to 2018. The results show that overall ULUEE, pure technical efficiency and scale efficiency were ecologically inefficient. Meanwhile, ULUEE differences between cities mainly reflect different levels of pure technical efficiency. Further, the linkage between urban population density and ULUEE can be expressed in inverted-U and U-shape curves, and most cities' industrial development positively affects ULUEE, while most cities' fixed asset investments negatively affect ULUEE. Moreover, land management institutions (LMIs) play a moderator role, shaping the main impacts of industrial development on ULUEE. Therefore, the findings suggest that improving ULUEE in the western region of China should focus on attracting inflows of highly skilled people, optimizing resource allocation, and guiding/regulating local government actions. [Display omitted] • Overall urban land use eco-efficiency (ULUEE), scale efficiency and pure technical efficiency of ULUEE are estimated and found to be eco-inefficient in the studied areas. • Slowing ULUEE improvement during the studied period results from slowing improvement of scale efficiency. • ULUEE differences between cities were mainly caused by pure technical efficiency. • LMI plays a moderator role in reducing the main impacts of industrial development on ULUEE. [ABSTRACT FROM AUTHOR]

• We analysed the influencing factors of urban eco-efficiency in Western China. • The US-SBM model and spatial econometric models were used for 84 cities' data. • Urban eco-efficiency showed a fluctuating upward trend during 2004–2017. • Economic development and urbanization had U-shaped impact on urban eco-efficiency. • Four explanatory variables showed a positive impact on urban eco-efficiency. Improving eco-efficiency can promote sustainable development. This study first evaluated the urban eco-efficiency of 84 cities in Western China from 2004 to 2017 by the undesirable-super-slack-based measure (US-SBM) and analysed their spatiotemporal characteristics, and then investigated its influencing factors using spatial econometric models. The results indicated that the urban eco-efficiency in Western China was at a relatively low level and showed a fluctuating upward trend with the highest average value of 0.65; however, capital cities of Western China have improved their eco-efficiency rapidly. Furthermore, there were obvious spatial spill-over impacts of the urban eco-efficiency in Western China. This paper also found that both the economic development level and urbanization level have "U" shaped impacts on Western China's urban eco-efficiency, which decreases at first and then rises. Similarly, increasing the proportion of secondary industry promotes urban eco-efficiency, and FDI, trade activities, improved environmental regulations as well as technological innovation capabilities have a positive impact on urban eco-efficiency in Western China. This paper also put forward corresponding policy suggestions to promote Western China's urban eco-efficiency. The present study may be helpful for policy-makers to balance economic development and environmental protection in Western China. [ABSTRACT FROM AUTHOR]