Objective To explore the application effect of the hospital-home dual-link cloud platform based nutrition management mode grounded based on the Information-Motivation-Behavioral Skills （IMB） model in patients with gastric cancer undergoing chemotherapy.Methods From October 2023 to March 2024, two oncology wards were randomly divided into two groups using a cluster randomization method, with 41 gastric cancer patients included consecutively in each group according to inclusion and exclusion criteria.The control group received conventional nursing care, while the intervention group was provided with the dual-link cloud platform based nutrition management mode grounded on the IMB model, which included comprehensive nutritional management from hospital to home via the cloud platform.Nutritional status was assessed using the Patient-Generated Subjective Global Assessment （PG-SGA） and serum nutritional indicators at 2 and 4 months post-intervention.Results After 2 and 4 months of intervention, the PG-SGA scores of the intervention group were significantly lower than those of the control group （P＜0.05）.Additionally, albumin, hemoglobin, and body weight were significantly higher in the intervention group compared to the control group （P＜0.05）.Conclusion The dual-link cloud platform nutrition management mode grounded on the IMB model can improve the nutritional status of patients with gastric cancer, promote reasonable dietary habits, and significantly reduce the incidence of malnutrition while enhancing patients′ quality of life.