To observe the effects of modified Buqi Yangyin Jiangtang Drinkcombined with metformin on qi and yin deficiency in the elderly with type 2 diabetes.Methods:A total of 84 elderly patients with type 2 diabetes admitted to Beijing Hepingli Hospital from April 2018 to October 2019 were selected as the study subjects and were randomly divided into a Western medicine group and a combined group，with 42 patients in each group.The 2 groups were given basic treatment.The control group was given metformin orally，and the observation group was treated with modified Buqi Yangyin Jiangtang Drink combined with metformin.The main symptoms，secondary symptoms and total scores，glucose metabolism level，clinical therapeutic effects，insulin resistance index level，and adverse reactions before and after treatment were compared between the 2 groups.Results:The main symptom，secondary symptom and total score，the level of glucose metabolism and insulin resistance index decreased，and the observation group decreased more significantly than the control group，the difference was statistically significant(P<0.05); After treatment，the total effective rate of the observation group was higher than that of the control group(P<0.05).Compared with the control group，the incidence of adverse reactions in the observation group was not statistically significant(P>0.05)and the adverse reactions were mild.Conclusion:For patients with type 2 diabetes mellitus with deficiency of qi and yin，modified Buqi Yangyin Jiangtang Drink combined with metformin can effectively control symptoms，improve glucose metabolism，enhance clinical therapeutic effects，reduce insulin resistance，and is safe.