Abstract：FAN Linyan believes that the core pathogenesis of obesity lies in spleen deficiency with phlegm-damp， while emphasizing the important roles of dysfunction of lung qi in dispersing and descending and the failure of large intestine in conveyance of waste in the formation of obesity. Wendan Decoction， originating from San Yin Ji Yi Bing Zheng Fang Lun （Treatise on Diseases， Patterns， and Formulas Related to the Unification of the Three Etiologies）， excels in regulating qi to resolve phlegm， and normalizing the gallbladder's function and harmonizing the stomach， serving as a basic prescription for treating internal obstruction of phlegm-damp. Based on this，the SHEN's Gynecology School modified the prescription to create the Wendan Decoction to regulate qi movement and resolve phlegm-turbidity. FAN Linyan inherits the academic thoughts of SHEN's Gynecology School. Her treatment approach focuses on the three zang-fu organs of lung， spleen， and large intestine， and integrates therapeutic methods of drying dampness and resolving phlegm， replenishing qi and invigorating spleen， ventilating lung to purge intestines， and promoting urination and defecation. This approach renders the resolution of phlegm-damp，smooth flow of qi，and unobstructed urination and defecation. The weight-loss prescription based on modified Wendan Decoction from SHEN's Gynecology School has satisfactory curative effect， providing theoretical and practical experience for the "lung-spleen-intestine" coordinated regulation in traditional Chinese medicine treatment of obesity.