Because of the complexity of influenced factor and the problem of selecting parameters

The bigger difference is consisted in the settlement value calculated and observed

the study on the prediction of settlement has the magnitude significance. The number of prediction problem of inadequacy information is successfully solved by using grey system theory

which is applied widely. The foundation of grey model is based on the equal interval original data. It is difficult to establish prediction model because the equal interval data is not obtained from the practical application. In order to overcome the grey model shortcomings

the grey model is improved. The unequal interval grey model is established and applied to predict the foundation settlement of Yangluo Power Plant chimney in Wuhan. The numerical simulation of the complete process chimney foundation settlement is used by FLAC3D program. The comparison research of the key point displacement by tracking and practical result by monitoring is studied. The result shows that the precision of prediction model is good and can be applied to practice.