Abstract: A method of evaluating core muscles by bioimpedance technology, includes the steps of: (a) measuring the resistance and reactance of a subject by a bioimpedance measuring instrument, and obtaining the subject's age, gender, and impedance factor (h2/Z), and (b) calculating the subject's core muscles by the following formula: BIA=a?b×age+c×h2/Z+d×Sex. Thereby, the present invention measures the cross-sectional area of the core muscles by means of bioimpedance analysis. The core muscles can be evaluated by the cross-sectional area of the core muscles, which can effectively reduce the measurement cost, reduce the measurement time and improve the convenience of measurement.