Zhang Xiantu passed away at her home in northern Shanxi province yesterday, according to Zhang Shuangbing, a campaigner for her claim.
"In her last days, Zhang still hoped that volunteers could help her continue the lawsuit against the Japanese government," state-run Xinhua news agency quoted Zhang as saying.
Historians estimated there were about 200,000 "comfort women," mainly from the Korean Peninsula, China, and other Southeast Asian countries, who were forced to serve in Japanese military brothels during World War II.
In 2009, Japan's top court recognised the crime but rejected their compensation claims.
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According to Zhang's account, she was only 16 and had been married for just a few months when she was taken by Japanese soldiers and thrown into a military brothel, where she endured 20 days of rape.
She has since been fighting chronic gynaecological diseases and psychological scarring.
"The status of 'comfort woman' brought huge stigma, but they lived on in order to testify to that part of history and to get an apology and compensation," Zhang Shuangbing told Xinhua.
Comfort women were women and girls who were forced into sexual slavery by the Imperial Japanese Army in occupied territories during World War II.