The effect of applying the non-equal interval Verhulst direct model in processing the data, which are non-equal interval, non-negative, and have index laws and saturated development trends, is greatly perfect.

Non-equal interval GM(1,1) model for forecasting embankment subsidence is set up by the building principle of grey theory model.

Based on the equidistant processing of the initial data, the non-equal interval GM (1, 1) direct model is established, which is a differential equation consisted of the inverse accumulated generating data list and the initial data list.

Based on the observation data from a construction in point and the gray theory, an unequal time-interval prediction model of recent information of identical dimension for ground settlement is established.

The non equal interval grey model is used to determine the paramaters of ground water resource computation in this paper.

This paper apply the gray system theories,regard unit cost of historyical similar item construction as the basis,establish the non-isometric time sequence GM(1,1) model of item construction unit cost.

Based on the relation between the starting-point annihilating images and initial images of unequal time interval sequence,this paper adopted several improved methods to calculate the generalized grey absolute relational grade and generalized grey relative relational grade,which can largely simplify the calculation.