Objective:To investigate the therapeutic effect of Yanghe decoction combined with Tounongpowder on patients with acute plasma cell mastitis and its influence on inflammatory factors.Methods:A total of 120 patients with acute plasma cell mastitis admitted to Yantai Affiliated Hospital of Binzhou Medical College from May 2019 to May 2020 were selected, and divided into control group (60 cases) and combination group (60 cases). The control group was treated with western medicine, and the combination group was treated with Yanghe decoction and Tounongpowder on the basis of the control group. Seven days was 1 course and a total of 4 courses were continued. The scores of symptoms and signs and clinical effects of the two groups before treatment and 1 month after treatment were compared. The serum interleukin(IL)-1β and IL-6 were measured by radioimmunoassay, and tumor necrosis factor-α(TNF-α) was measured by enzyme-linked immunosorbent assay.Results:After 1 month of treatment, the scores of breast swelling, breast lumps, breast pain, breast fistula symptoms and signs in the two groups were significantly decreased, the scores of above index in the combination group were significantly lower than those in the control group, and the differences were statistically significant ( P<0.05). The total effective rate in the combined group was higher than that in control group: 91.7%(55/60) vs. 76.7% (46/60), and the difference was statistically significant ( χ2 = 8.456, P<0.05). After 1 month of treatment, the serum levels of IL-1β, IL-6 and TNF-α in the two groups were significantly reduced, and the serum levels of above 3 index in the combination group were significantly lower than those in the control group: (3.24 ± 0.92) ng/L vs. (3.81 ± 1.02) ng/L, (1.12 ± 0.42) ng/L vs. (1.41 ± 0.35) ng/L, (32.27 ± 19.03) ng/L vs. (43.04 ± 21.58) ng/L, and the differences were statistically significant ( P<0.05). After treatment, the liver and kidney functions of the two groups were not abnormal, and the differences in adverse reactions such as headache, dizziness, nausea and vomiting were not statistically significant ( P>0.05). Conclusions:Yanghe decoction combined with Tounongpowder can significantly improve the clinical symptoms of patients with acute plasma cell mastitis, with a definite clinical effect. Its mechanism of action may be related to reducing the levels of IL-1β, IL-6, and TNF-α and reducing the inflammatory response.