Abstract: Based on qualitative and quantitative analysis, this paper focused on the time taken for expansion and the spatial evolution characteristics of construction land in Jiangsu Province from 1985 to 2015. By referring to the nearest neighbor index and spatial correlation method, the expansion direction and type of urban construction land were delimited, as were the spatial agglomeration characteristics. This paper diagnosed the dominant driving factors of urban construction land and analyzed the dominant driving factors in depth using multivariate linear regression and geographical detector. The major results were: first, the Jiangsu Province construction land extension showed Sunan > Suzhong > Subei. The period from 2000 to 2010 was the fastest for development of construction land. Second, self-correlation showed that the expansion of construction land in Jiangsu Province had an obvious agglomeration distribution pattern. Jiangsu Province had formed an urban sprawl distribution pattern along the Yangtze River, and it also exhibited urban agglomeration. The coordination and stability of the expansion of construction land in Jiangsu Province all showed that the geographical spatial pattern of Sunan was greater than Subei. The main time driving factors for the expansion of construction land were the industrial structure, population growth and the living standard of residents. The proportion of second and third industry is the core time driving factor of the expansion. GDP and population density were the leading spatial driving factors for the expansion of urban construction land in Jiangsu Province.