Abstract: Settlement of muddy clay includes immediate settlement and primary-secondary consolidation settlement on the basis of Terzaghi's consolidation theory. Using the settlement law of muddy clay, this paper puts forward a modified settlement-velocity ratio method to calculate muddy clay settlement. The method can predict the settlement of muddy clay by means of getting consolidation coefficient. The consolidation coefficient can be reached by analyzing the settlement velocity with least square method. The example shows that predicted settlements and measured values are anastomotic, which means that the method can provide references for similar projects.