In the long-term discourse practice of official management, the expression of official document main text has gradually formed a unique and stable textual pattern. However，most of the current official document textual patterns proposed by the official document academic circles still stay in the general description of the surface structure of the official document，and lack of the theoretical depth. By using the methods of text linguistics and text analysis，this paper deeply analyzes the deep structure of official documents，and innovatively constructs the four-dimensional logic chain pattern of official documents, that is background and reason-event and behavior-condition and guarantee-control and constraint. This pattern is highly consistent with the official management thinking of social organizations，and fully reflects the management situation and contextual characteristics of the official field. It not only provides a macro thinking framework for official document conception，but also provides a macro functional structure and semantic structure for the construction of official document texts and the organization of discourse information content，and provides a solid theoretical basis for official document writing and reading.