Theory of Archives Science is out of pace with practice in digital age. The disconnection includes three performances. The theoretical research field loses contact with practice field. Introduced theories are improperly conducive to guide local practice. Archival Science education is inappropriate fit to practical working demands. The main reasons of the disconnection include the differentiation of researchers, historical inertia and administrative system. The differentiation of researchers causes estrangement between theory and practice. Historical inertia results the lack of the innovation practice. Administrative system leads practice to ignore theory. The research of Archives Science should be based on the local practices and problems, joint researchers and practitioners. Improvement of education effect is also important. These measures all can contribute to integrate theory with practice.