Abstract： The proportion of overweight children within the obese population cannot be disregarded.Furthermore，obese children are susceptible to complications that may persist into adulthood.In order to prevent childhood obesity and manage its associated complications，it is essential to conduct appropriate assessments.In comparison to the body mass index（BMI）assessments，body composition analysis can measure the amount of adipose tissue，muscle tissue，body water，and inorganic salts.It can also assess body fat percentage，body muscle percentage，and muscle-fat ratio，which may be crucial in assessing body shape，basal metabolism，obesity and more.This enables accurate assessment and intervention.Bioelectric impedance analysis（BIA）is widely used in pediatrics as a method of analyzing body composition.However，its value in the study of obese children remains uncertain.This paper aims to summarize the value of BIA in the diagnosis and assessment of obese children and to assess its potential for screening for complications associated with childhood obesity，and reviews the performance of BIA in the assessment of obese children.