Abstract: The acquisition and update speed of urban foundational geographic data cannot keep pace with the speed of urbanization construction with the acceleration of land urbanization process.For the current situation of urbanization process, the paper analyses the characteristics of the urbanization construction and their representations of geographic data, and proposes a Group-based Incremental Updating Model (GBIUM) by utilizing the incremental updating technology.Such model generates the group-based incremental information based on the characteristics of geographic elements that are distributed in groups, and defines the spatial operation of group-based incremental information on the basis of group-based incremental information.At last, the paper formulates the standardized data transmission format and updating workflow based on sample regions in Wuhan and Shenzhen that are taken as experiments, and gives a detailed discussion on update process of geographic elements of urbanization construction by combining experiment and statistical results. Analysis with different models of urbanization construction and corresponding experiments illustrate the feasibility and efficiency of GBIUM in urban data updating.