Abstract: Based on the theory of seepage of groundwater and Terzzaghi's consolidation, this paper discussed a new prediction method combined with in-situ test. The paper introduced the concrete ideas of the new method, and corresponding calculation formulas were deduced too. The related parameters and the distribution laws of ground settlement can be derived from the in-sire pumping tests on wells, based on the relationship between drawdown and surface subsidence derived from the back analysis of the in-sire pumping tests, numerical simulation methods were used to predict the surface subsidence in the field. The results of engineering example showed that the method could better predict the surface settlement caused by dewatering of confined water, which is an effective method to predict the surface settlement.