An unequal time interval forecasting model of GM (1, 1) is established according to the grey theory in the present paper, which can be modified using the residual error GM (1, 1) model.

运用灰色理论建立了软基沉降的不等时距预测GM(1, 1)模型，并可用残差的GM(1, 1)模型对其进行修正。

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Then we investigate the effectiveness of the solution. Finally, we reveal that the method is reasonable and effective which can effectively reduce the error of interval forecasting by a concrete case.

最后，通过一个实例表明本文所提方法能够有效降低区间预测的误差，是一种合理和有效的区间组合预测方法。

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A new way of forecasting the price interval of convertible bonds is explored by means of this work.

该工作为可转换债券价格运行区间的预测探索了一条新的途径。

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