Surebaii, sitaraii , subekida and some other similar forms are often considered judgment words because they have the common property of judging. Usually these words can correspond with the Chinese word keyi, but there also exist some differences. Many researchers have studied the comparison of keyi and Japanese judgment tone words, including the series of papers of Lee (2006) (2007) (2009) (2010). This article mainly reviews this series of papers and at the same time gives some points of view on their shortcomings, thus provides some reference for future studies related. Through the analysis, the author thinks there exist some relevance and differences between Chinese keyi and Japanese judgment tone words such as Surebaii, sitaraii ,and subekida.