Visceral fat mainly indicates the content of visceral fat, which can currently be determined by imaging, ultrasonography and pathology. 1. Imaging examination: to clarify the thickness of viscera through CT and nuclear magnetic resonance, and to confirm whether there is serious adipose tissue attached to the viscera by measuring the CT value, observing different grayscale values and different imaging densities. 2. Ultrasonography: Through the echoes of each organ and different tissues to the ultrasonography, determine the visceral fat content through the strength of the echo signals. 3. Pathological examination: By obtaining visceral tissues for pathology, the specific composition of the viscera will be clarified according to immunohistochemistry, and it will be detected whether there is serious visceral fat.