Japan has begun to conduct Japanese General Social Surveys(:JGSS) from 2000 and made the raw data open to researchers. The JGSS data have the high possibility to be useful material in the area of empirical approach on Japan study. The paper tried to examine that how JGSS is composed in and what kinds of characteristics and limits it contains. It is significant features that JGSS has openness, comprehensiveness and advantageous to interdisciplinary approach, We, however, can not ignore limits such that research using JGSS raw data incurs the passiveness of study, non-time continuity and a nuance differences between languages. If Japan study by researchers puts minds on those features, we could expect that the empirical study by theory verification in social science approach make the progress in the near future.