Ding Ling's Sha-Fei Lady's Diary was published in the Novel Monthly in 1928, describing the story of the young woman Sha-Fei, which is Ding Ling's representative work. The novel has a clear individualism and female consciousness, with the attitude of a revolutionary female writer, continuing the thoughts of the May Fourth movement, paying attention to the destiny of women, and trying to break through tradition and walk out of a brand-new atmosphere. This paper focuses on Sha-Fei's psychological characteristics, and discusses Ding Ling's Sha-Fei Lady's Diary from the view of personality psychology, aiming to analyze the particularity of Sha-Fei's characters and highlight the two aspects of her female erotic autonomy and yearning for ideal love; Then explores Sha-Fei's personality adaptation, who has a protective sense of anxiety and self-defense mechanisms; Finally, from the perspective of psychoanalysis, starting from Jung's psychological type and Erikson's psychosocial perspective, deepening the character image of Sha-Fei in Ding Ling's works.