Objective: To under the prevalence of malnutrition and its associated factors in school aged children with cerebral palsy, so as to provide a basis for relevant departments to formulate targeted policies. Methods: From July to August 2023, the researchers selected 333 children with cerebral palsy and 960 children with other diseases aged 6-18 years who were residents of a social welfare institution in Guangzhou, China. Their height and weight were measured and a nutritional status analysis was carried out using a cluster sampling method. Multivariate Logistic analysis was performed to analyze the relative factors and malnutrition status of school aged children with cerebral palsy. Results: The prevalence of growth retardation among school aged children with cerebral palsy was 74.5%, with rates of stunting, normal nutrition status, and overweight/obesity being 17.7%, 7.2%, and 0.6%, respectively. The results of the univariate analysis revealed statistically significant differences in the detection rate of malnutrition among school aged children with cerebral palsy based on gender, gross motor function classification system (GMFCS) grading, and the presence of swallowing disorders ( χ 2=6.02, 15.23, 32.16, P <0.05). The results of the multivariate Logistic regression analysis showed that gender ( OR=0.37, 95%CI =0.15-0.91), dysphagia (OR=4.10, 95%CI =1.39-12.12), and GMFCS classification ( OR=1.45, 95%CI =1.04-3.01) were influencing factors of malnutrition ( P <0.05). Conclusions The detection rate of malnutrition among children and adolescents with cerebral palsy in welfare institutions was found to be relatively high, and influenced by various factors. Corresponding nutritional interventions should be developed and implemented based on the risk factors of malnutrition in school aged children with cerebral palsy to improve their nutritional status.