Abstract: The fragmentation of arable land leads to high agricultural production cost and low efficiency. In order to improve the utilization efficiency of arable land, it is necessary to realize the centralized management of arable land. Aiming at the problem of data redundancy and grid scale selection when the uniform grid is used to express the arable land area, this paper proposes a method to determine the optimal starting and ending scales of the grid according to the average area of the patch and the area expression error, and constructs a non-uniform grid based on the quadtree. The analysis rules, evaluation index system and technical process of arable land centralized connection are established to realize the classification of arable land centralized connection under non-uniform grid. Taking Xuzhou city of Jiangsu province as the experimental area, the concentrated contiguous analysis of arable land is carried out. The results show that:①Compared with uniform grid, non-uniform grid reduces 43.8% data redundancy, realizes the minimum error expression of arable land area, and has stronger applicability.②The area of arable land in Xuzhou accounts for 88.6% of the total area of arable land, of which 50 % of the arable land is concentrated in the upper middle level.③In the contiguous area, 21.4% of the arable land is concentrated below the middle level, which should be used as the arable land to improve the overall level of the region.

Key words: arable land, concentrated contiguous, grade division, non-uniform grid