Borderline Personality Disorder is a highly prevalent mental illness characterized by a lack of self-awareness and difficulty in controlling emotions, which leads to extreme mental and behavioral manifestations of opposition. This may be attributed to the low psychological resilience of individuals with BPD, thus making the development of effective interventions to improve psychological resilience crucial. From the perspective of expressive writing, it emerges as a hopeful approach to reducing symptoms and improving psychological resilience. By way of expressive writing about meaningful positive emotional events, it helps the patients in objective assessment of personal issues, strengthening self-awareness, and regulating emotions. This, in turn, contributes to an improvement in psychological resilience and symptom alleviation. This case study also presents relevant implications and recommendations, including a step-by-step intervention approach, the identification of emotional changes, and an intervention process guided by appropriate values.