This study, based on Ding Ling's novels "Ms. Shafei's Diary" and "When I Was in Xia Village," explores the dual function of illness imagery in the politics of the female body. Addressing the theoretical gap in existing research that overlooks illness as both a disciplinary tool and a resource for resistance, this study, drawing on Foucault's theory of disciplinary power and Butler's theory of gender performativity, to reveal how patriarchal social structures appropriate illness , shaping the female body into objects of discipline and exclusion through the moralization of medical discourse, the stigmatization of chastity, and spatial isolation and panopticon surveillance. Furthermore, it analyzes how the female characters within these contexts transform illness into a weapon of resistance. This study employs a method combining critical discourse analysis with close reading of texts. The analysis finds that illness profoundly reveals the disciplinary imprint of power on women's bodies. However, Shafei and Zhenzhen, by refusing to play the imposed scripts of "sickly woman" or "stigmatized victim," engage in differentiated "counter-performative" resistance. Shafei, an intellectual woman, deconstructs discipline at the discursive level by questioning medical authority, reversing the male gaze, deconstructing myths of love and marriage, and writing intimate diaries. Zhenzhen, a rural lower-class woman, challenges the chastity order in a more public and embodied way through detached narratives, declarations of a "hardened heart," rejection of marriage as a "redemption," and ultimately leaving the village. The conclusion points out that Ding Ling's writing about illness not only exposes the disciplinary mechanism of collusion between medicine, morality and space in the process of modernity , but also, through the resistance path of class differentiation, demonstrates the resilience of women in transforming the battlefield of the body into a space for constructing subjectivity, revealing the body political essence of "resistance is existence".