Detailed analysis of some difficult aspects has been made from modeling the platemovement. A new method of using differential density of material (instead of differentialtemperature) has been developed in the experiments. The effect of convection of mantleon the plate movement has been studied using a centrifugal technique, and a patternshowing the recurrence of the plate movement has been successfully obtained. In this paper, a criterion De=Dm is presented for the similarity of the model to thecounterpart of the original mantle. According to the criterion, what happens in the modelin a span of ten minutes suggests a process of the “original model” going on in geologi-cal time of three million years. Detailed analysis of some difficult aspects has been made from modeling the platemovement. A new method of using differential density of material (instead of differential temperature) has been developed in the experiments. The effect of convection of mantleon the plate movement has been studied using a centrifugal technique, and a patternshowing the recurrence of the plate movement has been successfully obtained. In this paper, a criterion De = Dm is presented for the similarity of the model to the counternpart of the original mantle. According to the criterion, what happens in the modelin a span of ten minutes suggests a process of the “original model ” going on in geologi-cal time of three million years.