Based upon the building mechanism of unequal interval grey forecast model in order to weaken the changing scope of data,the method to extract the m root of accumulated sequence was used.

Unequal interval grey revised model was built based on unequal interval grey model and grey revised model,which is fit for the original series with unequal interval and sharp variations.

According to the building mechanism of gray model,a combination forecast method of unequal interval gray forecast model is presented to solve practical problems for the number sequences.

The paper analysed the existing fatigue experimental data processing,and gave a nonequidistancegrey GM(1, 1) model and method on the fatigue experiment data processing and on-line control.

Based on the study of nonequidistance sequence, we have applied nonequidistance accumulated generating to the modeling of nonequidistance, and made the original model improved.

As the background value is an important factor affecting the precision of grey system model,this paper makes a research on the background value in non-equidistant GM(1,1) model.

A Gray Mold for Non-equidistant Sequence;

On the non-equidistant sequence grey model research base,using Matlab,giving the Implementation Program of grey model for non-equidistant sequence,it is to provide a good solution to the problems of prediction in establishing models for non-equidistant sequence.

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.