Objective To identify, evaluate, and summarize the best evidence on dietary management of children and adolescents with type 2 diabetes mellitus (T2DM) at home and abroad, and to provide references for clinical nursing practice.Methods Evidence on dietary management of T2DM children and adolescents was systematically searched in guideline websites, professional association websites, and databases, including clinical decision-making reports, best practices, guidelines, expert consensus reports, syste-matic reviews, etc.The search time frame was from January 2014 to May 2024, and the methodological quality of the included li-terature was evaluated by 2 researchers, and the data were extracted and evidence was summarized from those literature that met the criteria.Results A total of 15 publications were included:1 clinical decision making reports, 5 guidelines, and 9 expert consensus reports.A total of 38 pieces of best evidence were summarized in six areas: management goals, assessment, body weight management, nutrient recommendations, dietary management for exercise, and teamwork and education.Conclusion This study summarized the best evidence for dietary management of T2DM children and adolescents, which can be used as a reference for nursing staff to carry out clinical practice.Healthcare professionals can personalize the application of relevant evidence in conjunction with clinical scenarios to promote scientific management of patients.