Seventeen(six groups) brick masonry columns wrapped by equal interval GFRP sheets and six(two groups) brick masonry columns for comparison were tested under axial compression.

First a function is used to reduce each gray frequencies to shorten the gap between the maximum and the minimum gray frequencies,then classic histogram method is used for the new array,so the new valid gray level is obtained;at the last the gray level is reconstructed with equal interval in the whole display region.

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.

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.