Abstract: The method includes the following steps: first establishing urban street and urban plot elements, delineating publicly used parts of public and private property areas as streets, and delineating boundaries of privately owned land as plots; after defining urban streets and urban plots, obtaining accessibility levels of the street elements through depth, connectivity, and low connection rate, where the accessibility level of an urban plot includes an external value and an internal value, the external value is obtained through the levels of urban streets connected to the plot, and the internal value is obtained through the delineation of interlocking structure, basic structure, cul-de-sac structure, and embedding structure types of the urban plot and the urban streets; and based on calculation results of the accessibility levels of the urban streets and urban plots, making judgments from four aspects: upper level planning, commercial system, community system, and historic resources.