Abstract: Focus on the difficulty of storing and analyzing in the process of organizing and managing spatio-temporal data of BDS,this paper selects spatio-temporal data of BDS as the research object and analyses its characteristics. Idea of space-time granulation is introduced to express it from three granularities: space-granularity, time granularity and space-time granularity. According to the method of Object-Oriented and Modified models of Ground State, the conceptual model of multi-granularity spatio-temporal data of BDS are given.A method to construct multi-granularity spatio-temporal data model based on BDS is proposesed. One example proves that this method can realize the organization and management of spatial-temporal data of BDS.