The accurate prediction of soft ground settlement after construction is very important to evaluate the treatment method and promote treatment quality. Flat dilatometer test (DMT) can get soft soil property quickly and exactly. A settlement calculation formula of sand and common soil was given by Matchetti; but it is not fit to structural soft soil in the beginning loading. After treatment
soft ground settlement tends to stable; and DMT data and Marchetti formula can be used to predict settlement after construction. A conclusion is drawn from the comparison with several other ordinary methods that DMT can predict soft ground settlement after construction more exactly.