Abstract: Excessive expansion of the construction land caused by industrialization and urbanization has been a hot issue of the land resources research. In this study, based on Shapley value decomposition method of the semi-logarithm regression equation, we investigate the driving factors of construction land expansion of 26 cities in the Yangtze River Delta urban agglomeration, which is based on Shapley value decomposition method of the semi-logarithm regression equation. In the meanwhile, we investigate their contribution rate to the regional differences. The sample data range from 2006 to 2015. The results showed that:（1) these factors, which include the amount of reserved cultivated land, the adjustment of the industrial structure, the utilization efficiency of the construction land and the ecological pressure, etc., have a negative driving effect on the construction land expansion. In contrast, the factors, including the speed of economic development, the speed of population urbanization, the deficit and the government’s policy execution, etc., have a positive driving effect. However, the driving effects of the amount of reserved cultivated land and the ecological pressure on the construction land expansion are not significant.（2) the driving effect of the following factors on the regional differences of the construction land expansion are significant, which include the utilization efficiency of the construction land, the deficit and the government’s policy execution, etc. Therefore, in order to slow down the excessive expansion of the construction land, strategies such as resource constraint, ecological protection, the promotion of the adjustment of industrial structure, the implementation of the structural reform of land supply side, and the enhancement of the construction land efficiency, etc., should be taken into consideration.