The purpose of this study was to employing MRI in the estimation of the biomechanical body segment parameters of Korean adults. for this purpose MRI study on 19 Korean living subjects were used to measurement. All the parameters that was concerned were inertial characteristics of human body mass of each segment, center of mass of them and the length of radius of gyration of them. The cross sectional images and saggital images of every 1cm interval were got using the 0.5 Tesla MRI from the top of head to the bottom of foot, whole body. And then, by tracing the images of the film and scanning them, got the area which the several tissues occupied in the image of slice. By summing the area of slice of each segment which were calculating and by multipling the density of the tissues, got the mass of segment and other inertial characteristics. The ratios of radius of gyration in both transverse axis and longitudinal axis though the segmental mass and segment length are as follow: male A : head($0.229pm0.0029$), neck($0.256pm0.0095$), thorax($0.374pm0.0059$) abdomen($0.245pm0.0020$), pelvis($0.368pm0.0106$), thigh($0.288pm0.0030$) shank($0.280pm0.0043$), foot($0.277pm0.0195$), upperarm($0.311pm0.0074$) forearm($0.286pm0.0051$), hand($0.253pm0.0095$) female A : head($0.214pm0.0032$), neck($0.254pm0.0112$), thorax($0.295pm0.0061$) abdomen($0.289pm0.0021$), pelvis($0.329pm0.0108$), thigh($0.288pm0.0036$) shank($0.280pm0.0047$), foot($0.243pm0.0206$), upperarm($0.279pm0.0083$) forearm($0.286pm0.0048$), hand($0.229pm0.0097$) male B : head($0.532pm0.0006$), neck($0.533pm0.0006$), thorax($0.658pm0.0008$) abdomen($1.350pm0.0022$), pelvis($0.875pm0.0002$), thigh($0.213pm0.0001$) shank($0.160pm0.0001$), foot($0.152pm0.0002$), upperarm($0.136pm0.0002$) forearm($0.202pm0.0002$), hand($0.273pm0.0006$) female B : head($0.198pm0.0002$), neck($0.335pm0.0011$), thorax($0.238pm0.0001$) abdomen($0.888pm0.0001$), pelvis($1.318pm0.0117$), thigh($0.095pm0.0001$) shank($0.075pm0.0001$), foot($0.181pm0.0006$), upperarm($0.0.062pm0.0001$) forearm($0.083pm0.0001$), hand($0.105pm0.0007$).