The degree of frailty in the elderly can reflect physical condition, Identification of risk factors can facilitate intervention in frailty and improve the prognosis and quality of life in the elderly. Studies have found that obesity is related to frailty and that body mass index (BMI) and waist circumference (WC) can be used to evaluate the degree of obesity. BMI serves as an indicator of the degree of obesity, and WC is closely related to metabolic disorders. This paper reviews the research progress on obesity and frailty using BMI and WC as indicators with a view to clarifying the relationship between them and providing new insights for clinical intervention in frailty.