Objective To explore the efficacy of the geriatric interdisciplinary team(GIT)service for elderly patients with multimorbidity and malnutrition.Methods We selected 109 elderly patients with diabetes mellitus(DM),chronic obstructive pulmonary disease(COPD)or chronic heart failure(CHF)and multi morbidity to the Department of Geriatrics of The 2nd People's Hospital of Kunming City from January 2022 to January 2023.The patients were randomly divided into the control group of 53 cases and the observation group of 56 cases.The control group received routine management of multimorbidity and malnutrition,while the observation group used the GIT service model to manage multimorbidity and malnutrition.The disease,nutritional status,and quality of life outcomes of the two groups of elderly patients were evaluated before and 3 months after the intervention.(1)HbA1c was detected in patients with DM in both groups,and the aggravation of patients with COPD or CHF was observed and recorded.(2)Nutrition-related indicators(Tp,ALB and Hb)and Barthel index were evaluated in both groups.Results(1)The HbA1c of patients with DM in the two groups decreased after intervention(P＜0.001),and the decrease in the observation group was more significant than that in the control group(P＜0.001).(2)The number of AECOPEs in patients with COPD in the two groups decreased,and the observation group was less than the control group(P＜0.05).(3)The number of CHF acute exacerbations in patients with CHF in the two groups decreased and the observation group was fewer than the control group(P＜0.05).(4)The TP,ALB,Hb and Barthel index scores of the two groups increased compared with those before intervention,and the observation group increased more significantly than the control group(P＜0.05).Conclusion The geriatric interdisciplinary team service for the elderly has a good effect in the intervention of elderly patients with multimorbidity and malnutrition.