Objective:To investigate the clinical efficacy of Yiqi Yangyin decoction combined with metformin and irbesartan in treating type 2 diabetes complicated by hypertension with qi and yin deficiency syndrome. Methods:A case-control study was performed to retrospectively analyze the clinical data of 92 patients with type 2 diabetes complicated by hypertension with qi and yin deficiency syndrome. These patients received treatment at the First People's Hospital of Huzhou from February 2021 to April 2023. They were divided into two groups, with 46 patients in each group, based on different treatment methods. The control group received metformin and irbesartan, while the observation group was treated with Yiqi Yangyin decoction in addition to the treatment provided to the control group. Both groups underwent treatment for 1 month. The clinical efficacy of the two groups was evaluated, and the changes in traditional Chinese medicine symptom scores, blood glucose levels, blood pressure, and the occurrence of adverse reactions were compared between the two groups before and after treatment. Results:The total response rate of the observation group was 93.48% (43/46), which was significantly higher than that of the control group [82.61% (38/46), χ2 = 5.63, P < 0.05). After treatment, the traditional Chinese medicine symptom score for the observation group was (9.43 ± 2.11) points, which was significantly lower than that of the control group [(12.11 ± 2.32) points, t = 11.34, P < 0.001]. The fasting blood glucose, 2-hour postprandial blood glucose, and glycosylated hemoglobin levels in the observation group were (7.51 ± 1.34) mmol/L, (9.06 ± 2.11) mmol/L, and (6.23 ± 0.76)%, respectively, all of which were significantly lower than those in the control group [(8.75 ± 2.12) mmol/L, (11.15 ± 2.43) mmol/L, (7.11 ± 1.02)%, t = 4.13, 6.14, 4.01, all P < 0.05]. The systolic blood pressure in the observation group was (125.48 ± 8.14) mmHg (1 mmHg = 0.133 kPa), which was significantly lower than that in the control group [(131.32 ± 9.22) mmHg, t = 6.76, P < 0.001]. The difference in the incidence of adverse reactions between the two groups was not statistically significant ( P > 0.05). Conclusion:Yiqi Yangyin decoction combined with metformin and irbesartan is highly effective in treating type 2 diabetes complicated by hypertension with qi and yin deficiency syndrome. This combined therapy can effectively lower the traditional Chinese medicine symptom score, improve patients' blood glucose and blood pressure levels, and has a low incidence of adverse reactions.