In the present paper, a method of predicting plastic strain of soils under repeated loading is pursued using triaxial and modified oedometer tests. In the first half part of the paper, time-dependent deformation characteristics were examined through the repeated triaxial tests on a compacted sandy soil. In the latter part, specially devised oedometer tests and triaxial creep tests under repeated loading were performed on various kinds of remolded and undisturbed cohesive soils. A method for predicting the converged strain for soil specimens under repeated loading is proposed making use of this simplified law.