- 2022 - 2026 明清交替期における辺境統治の様態ー皇帝側近官僚の辺鎮派遣をめぐる中央と地方ー
- 2018 - 2022 What a comoreehensive survey of the old book collection of the Keiko-kan Hirosaki Clan School can tell us about knowledge acquisition in the early modern Tsugaru region
- 2014 - 2018 Study on frontier governance seen from the military judgment and the military evaluation in the Ming dynasty
- 2014 - 2018 The development of relationships between port cities and their inland regions from historical perspectives
- 2010 - 2014 bureaucratic personnel affairs,policy formation,korea-relations around Liao-dong district in the Ming dynasty
- 2007 - 2010 The Changing Intermediary Role of Slaves, Immigrants and Mixed Blooded People between Local and Foreign Communities at Port Cities during the 19^<th> and 20^<th> Centuries
- 2004 - 2006 档案・文集史料からみた中朝関係の様態-14・15世紀の明朝・朝鮮・女直-
- 2002 - 2004 The Distribution of Goods, Movement of Population, and Language Issues in Contiguous Areas in Early Modern China
- 2001 - 2001 近世東アジアの地域秩序研究-14・15世紀の明朝・李朝・日本をめぐる政治と外交-
- 中国政治・外交史
- the history of Chinese politics and foreign policy
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