- Contemporary literature history of japan
- The impact of the views on wild words and flowery expressions in the history of japanese literature
- It is said that the tale of war represents a new literature genre of the middle ages in the japanese literary history
- His significant and inspiring contributions include : treating historical divisions of modem japanese literature on the basis of historical facts and literary works ; emphasizing the thought of " this life " and aesthetic features in japanese literature as a whole ; his research approach stressing a cultural perspective and " seeking differences in similarities "
他在近代日本文学史的史期划分上重史实、重文学本体；在日本文学的总体特点上强调现世思想和“美之爱好” ；在研究方法上强调文化角度和“同中求异” ，这些都对后来者有重大的启示意义。