Abstract: A thorough understanding of current land use is needed in order to optimize the development of regional land, increase the efficiency of land utilization, and provide a sound basis for planning sustainable regional development. This paper investigates land use functions in Jiangsu Province over recent years by constructing a rating system for the multi-functionality of land use, combining economic, social and ecological aspects, and analyzing these data using an entropy weight TOPSIS model. The results reveal that, from 2006 to 2016, the development of the comprehensive functions of land use in Jiangsu Province has trended from average to good showing continuous optimization. The development of the economic function has gone from poor to average to good to excellent to good this is an overall growth trend despite its fluctuations. The social function went from poor to average to good to excellent showing a sustained and steady improvement, whereas the ecological function went from average to good to average, with an overall downward development trend. The barriers to the sub-goals of improving the economic and social functions of land use have been reducing year by year, making the ecological function the main constraint on increasing the efficiency of land use in Jiangsu Province. To address this issue, it is necessary to reduce the ecological damage caused by pollution such as wastewater discharge and industrial solid waste and to better protect water resources. Furthermore, narrowing the developmental disparity between urban and rural areas and promoting urban-rural integration will be essential to ensuring a more balanced development of the economic, social, and ecological functions of land use.

Key words: multi-functionality of land use, entropy weight, TOPSIS model, obstacle