[Objective] Taking Pingdu City in Shandong Province as a case study, this paper analyzed the changes in land use pattern, land-type connectivity and core patches of cultivated land and construction land from 2005 to 2013, in order to provide a scientific basis for protecting area cultivated land effectively and planning construction land reasonable.[Methods] Based on the analysis of landscape index, we calculated integral index of connectivity(ⅡC), probability of connectivity(PC) and the important value of patch connectivity(dI) to reveal the connectivity of land types and importance of patches of cultivated land and construction land.[Results] (1) Compared with cultivated land, the distribution of construction land was strongly influenced by human activities;(2) The connectivity of construction land increased significantly, while the connectivity of cultivated land decreased from 2005 to 2013;(3) The core patch area of cultivated land accounted for 99% of cultivated land area, in contrast, the core patch area of construction land accounted for 79% of construction land area.[Conclusion] Due to the high-connectivity and high utilization efficiency, the core patches of cultivated land need to be well protected. The core patches of construction land need to be well planed and utilized due to its good connectivity and satisfactory geographic location. It is necessary to control expansion of construction land, the emissions of pollutants, and to protect the surrounding cultivated land.