In order to predict long-term settlement accurately in the poor condition of data, this article adopted linear regression equation and exponential equation combination model. Combination with the engineering practice example forecast and actual observation data comparison and good xesult have been achieved. It is verified that linear regression com- bined model can be applied to forecast the feasibility of subsidence monitoring. Through comparing residuals and regression analysis with grey prediction GM (1,1) model residual phase, this paper ...