Abstract: In this paper, by studying the component system of ISO12006 standard, based on the theoretical foundation of domestic building information model classification and coding standards, combined with the characteristics of ancient architecture, taking Song-style construction system as the research object, we put forward a kind of ancient building information model classification and coding method, and based on the Revit 2020 version of the development of the ancient building automatic coding plug-in, which can be given to the ancient buildings in batch according to the model, thus facilitating the reuse of information and the quantification of standard informatio. This facilitates the reuse of information and the quantification of standard information, and provides a reference basis for the classification and coding and application of the ancient architecture information model.