Abstract: A new accessing technology of database is proposed based on data dictionary. It can get data dictionary from data catalog of database and generates structures of program objects automatically. And then applications can access database by using objects defined by these structures directly. The data dictionary will make the objects adapting database itself, and also can accomplish objectification by transforming between applied objects and database structures each other. It performs a universal object-oriented accessing technology of database by building dynamic coupling between database and applications. This principle has advantage of development easily, good versatility and high efficiency.