‘Tsugi-fumi’ was one of the official documents, which appeared and mainly acted in the latter half of the Heian period. The distinctive feature of Tsugi-fumi revealed itself in its own form; papers related with each other such as Gebumi (_??__??_, a written application), Kanmon (_??__??_, a report submitted) or Kanpu (_??__??_, a paper recording a government ordinance) were jointed together into one longer document, when they were supplied for practice of government affairs. This Tsugi-fumi, as well as other forms of documents, was accumulated in the Dajokan (_??__??__??_, the government office) and carried its function as a precedent, especially in the case of Shokoku-joji-sadame (_??__??__??__??__??_, the discussion by court nobles on several applications from the provincial governors). This feature shows that Tsugi-fumi was the original form of ‘precedent’. We can see some models of it; as called Chikararyo (_??__??__??_)—, Kageyushi(_??__??__??__??_)— Kan (_??_) Tsugi-fumi etc., in the Choyagunsai (_??__??__??__??_) or diaries written by nobles. It can be said that Tsugi-fumi had made its appearance toward the end of Engi (_??__??_) era. From this era, the administration of the state, based on the basic codes of Ritsu and Ryo, became liable to be under blind submission to precedents; while court ceremonies became matters of the greatest interest to central officials. It is now generally understood that in the Engi era, the centralized-state began to be ruined and to limit its sphere of influence on the aristocratic society in the Miyako. Nevertheless, from the standpoint of administrative system carrying out the routine events, we have to recognize the mechanism of Dajokan, which all the time maintained its essential functions. This small thesis, discussing the treatment of official documents, shall analyse one aspect of Dajokan-administration system in the decline of Ritsuryo State. Tsugi-fumi itself did not play a great role in the political society, but the observation of it will surely supply us a certain side of Dajokan system.