There have been several records of the shiniang phenomenon in Jiangnan region since the Yuan and Ming dynasties. Shiniang, a local appellation, refers to a kind of spiritual mediums who have the mysterious power to heal patients with rare disease, or dispel evil spirits for people who are either suffering from bad luck or caught up in calamities. Their rationale for the cause of diseases or deliverance rituals are inexplicable by science. Through a long-term field study, this article gives a comprehensive description of shiniang in the Changshu region of Jiangsu Province, including the evolution, judicial ritual, and ways of exorcism, daily cultivation, self-recognition and relation with ritual personnel, etc. In addition, I devote an entire section to the introduction of the Changshu-exclusive "shiniang precious scrolls," with an annotated bibliography appended. It is hoped that this typical case will advance the investigation, understanding and research of the perpetuation of shiniang in the entire Jiangnan area.