The invention discloses a method and a system for realizing active directory based on rules. Directory rules are set by a user; extend markup language (XML) files used for describing directory rules are generated by a directory rule designer according to the directory rules set by the user and corresponding fields in a database table; and the XML file is interpreted and run by a directory rule running interpreter, so as to obtain a dynamic directory tree. A dynamic data directory provided by the invention provides the user with the method for effectively managing multi-source heterogeneous data, particularly managing spatial data; and the invention has the advantages of dynamics, real time for users and randomness of application demand.