Abstract: In this paper a model of three elements is proposed for discussing the convergency of the load transfer method. With the helf of this midel it was shown that the method is un-conditionatiy convergcnt for no tension material, upon which only tensional forces act. In general, however, the convergency depends on the load increments for static analysis, and on the time step Δt for dynamic analysis. It will converge rapidly , provided that Δt is small enough. The conclusions were confirmed by analyzing a soil-structure interaction system.