This study was carried out to investigate mechanical characteristics of the uniformly loaded skew-plate at 4 kinds of boundary condition ; i) all edges are clamped (BC-1), ii) all edges are simply supported (BC- 2), iii) two opposite edges are clamped and the other two edges are free (BC-3), and iv )two opposite edges are simply supported and the other two edges are free (BC-4). Various skew angles, 0°, 10°, 15°, 30°, 40°, 45°, and 60, of the plate were tested for the above boundary conditions. Resutts obtained from the study are summarized as follows ; 1. The lateral displacement at the center of a skew- plate was decreased as the skew-angle increased at all of the boundary conditions. The decrements of the conditions of BC-3 and BC-4 were considerable. And, difference of the displacement between the boundary conditions was decreased as the skew-angle was increased. 2. X-moments (to the Y-axis) at the center of a skew- plate and the minimum principal moments were shown as a similar pattern of change with respect to the skew-angle variation between BC-1 and BC-2 and between BC-3 and BC-4, and the pattern of change at the conditions of BC-3 and BC-4 were shown higher rates than those for the conditions of BC-1 and BC-2 3. Y-moments (to the X- axis) at the center of a skew-plate and the maximum principal moment were decreased as the skew-angle increased in a similar pattern at all of the boundary conditions. 4. X-moments at the obtuse angle side of a skew-plate were shown as a parabolic pattern of change (frist increased after then decreased) as the skew-angle increased, and a skew-angle resulting the maximum absolute moment was depended on the boundary conditions. 5. Y-moments at the obtuse angle side of a skew-plate were affected by the skew-angle much more at the boundary condtions of BC-2 and BC-4 than at the conditions of BC-1 and BC-3. 6. Maximum principal moments at the obtuse angle side of a skew-plate at the skew angle of 40°-45° were resulted almost the same value at all of the boundary conditions.