Abstract: Land use mode has entered a transitional period as new urbanization advances, and an in-depth analysis of land use versatility can provide theoretical support for scientific land use layout.Taking 55 counties in Jiangsu Province as the research object, the three-dimensional functional recognition system of land-based space was constructed from the three dimensions of production-life-ecology. The spatial pattern characteristics of the “production-living-ecological” function in the county of Jiangsu Province were analyzed by means of GIS spatial analysis and spatial econometric model. It was a way that combing geo-detector with bivariate spatial autocorrelation method to reveal the mechanism of action, and optimization strategies proposed based on the difference of dominant functions.The results showed:(1)The spatial distribution of production-life-ecological function land in Jiangsu Province was obvious, showing that production space dominated by Nanjing, Suzhou and Wuxi city, ecological space surrounded by Hongze Lake, coastal and closed to the mountain and the agglomeration characteristics of living space centered on towns and cities.(2)The regional economic development level, living carrying capacity and ecological factors jointly drived the spatial pattern of the “Sansheng” function. There were obviously intensity differences and spatial heterogeneity among the influencing factors. The four types of influencing mechanisms listed as economic development-life carrying influence, ecological conservation-life promotion influence, agriculture Production-life development restriction, economic development-life bearing restriction were different and appeared from southeast to northwest.(3)On the one hand, according to characteristics of strength, weakness,primary and secondary in different spaces of three dimensions features of production, life and ecology determined the four functional areas,which respectively was production-life domination function area, production dominated with life promoted function area, ecological dominated with production restricted function area and production function dominated with ecological cultivated funtction area. On the other hand, through strengthening production living function cohesion and conservation ecological function as the main line of logic, finally corresponding land use strategies summarized.The research results not only clarify the land use function location of every county unit in Jiangsu Province, but also provide a theoretical basis and practical reference for optimizing the main function zoning and rationally regulating the regional functional structure, and also provide a scientific basis for improving the capacity of regional sustainable development.