The invention discloses a method for realizing a dynamic form domain based on an OFD (Orthogonal Frequency Division Multiplexing) document, which comprises a domain analysis module and a domain editing module, and is characterized in that the domain analysis module provides a function of analyzing the dynamic form domain, can analyze an XML (Extensible Markup Language) format file in the OFD document, and can obtain an object identifier and attribute contents of the dynamic form domain after analysis; and the domain editing module provides an editing function for the OFD document dynamic formdomain, and the editing function comprises the functions of adding a dynamic form domain, modifying the dynamic form domain and deleting the dynamic form domain. According to the invention, the function of the OFD document dynamic form domain is realized. An application program which does not support the OFD document dynamic form domain at present is compatible, a form domain information storage file, a domain analysis module and a domain editing module are self-developed completely, and a completely available further optimization space is provided.