- 2009 - 2011 Immigrant Communities and Language: language contact and language policy
- 2005 - 2008 Language Reform and Modernity ; an East Asian Perspective
- 2004 - 2006 A sociolinguistic study of the languages of immigrant communities
- 2002 - 2005 Contrastive Studies of Grammaticalization and Categorization in East Asian Languages : From Particulars to Universals
- 2001 - 2004 Research on the International Communication between Young People in the New Era of Japan-Korea Relations
- 2000 - 2003 A Study on Languages and Modernity in Chinise Script Culture Area
- 2000 - 2002 危機言語の記述とその動態論的研究-移民コミュニティにおける言語の変化-
- 1999 - 2001 Contrastive Studies of Grammaticalization and Categorization in East Asian Languages
- 1997 - 1999 research of dictionary and teaching materials of Japanese as a foreign language
- 1992 - 1993 Survey Research of "Mutual Misunderstanding" between Native and Non-native Speakers of Japanese Concerning Respective Linguistic Behavior - A Case-method Approach in English, Thai, korean and Frendh -
- 1991 - 1992 Contrastive Linguistic Research between Japanese and Other Languages in Asia. - Tense.Aspect -
- 1988 - 1990 A Study on Tense, Aspect and Voice in Modern Japanese
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