Plate anchors are primarily used in the foundation construction of earth-supported and earth-retaining structures. In order to estimate uplift capacity as well as suction force of clay, model tests were performed with respect. to various embedment depths and two different moisture contents in the prepared saturated kaolinite. Further, suction effects on the ultimate uplift capacity, at the various embedment depths of anchor, were also taken into account. Test results show that, ultimate uplift capacity including suction force increases from 4.2㎏ at H/D=1 upto 11.6㎏ at H/D=5 in K1 and from 2.3㎏ at H/D=1 upto 7.3㎏ at H/D=5 in K2 respectively. The ratio of F_s/Q_n decreases along with the increases in the embedment ratio. In general, mud suction force under the ultimate uplift capacity in kaolinite decreases or become constant along with the increase of the embedment ratio.