This paper aims to provide an understanding of the development process by reviewing the oral and testament studies of Japanese military Comfort Women victims for about 30 years since Kim Hak-soon’s public testimony in 1991. The subjects of the review are the reports on research projects related to oral and testament of Comfort Women victims by the Korean Ministry of Gender Equality and Family and the testimony books produced by various actors. As a result of the review, the oral and testament researches of Comfort Women victims have achieved the following results due to the courage of the victims who broke the silence and the passion and dedication of the investigative researchers. First, it provides basic data to understand not only the trauma of Comfort Women but also the their lives after returning country. Second, it makes us understanding that the victims did not have an individualized and stereotyped image of victimization, but rather communicated with local residents as subjects with individual personalities, gaining social recognition, and establishing relationships with the local community. Third, through the publication of testimonial books and the digitization of testimony materials, the primary data of oral and testimonial have been accumulated considerably. It is a valuable resource that will contribute to the restoration and open interpretation of the life of the witness that was conceived in the original testimonies. Meanwhile, challenges remain. First, in order to achieve one-off events such as Independence Day, and Memorial Day, oral and testimonial research has been conceived and promoted in a short period of time. We should allow research to accumulate in the long term rather than a one-off project. The second is the firmness of the impact of the formalization of the victim and the claim of forced arrest by physical force. This Firmness can be a constraint on various oral and testament studies. Now, the victim statements and testimonies have reached a level where they can be assessed as comprehensive. In order to deepen oral and testimony research, the results of the reports on research projects by the Korean Ministry of Gender Equality and Family which is currently closed to the public, should be made public.