说明组合预测方法产生的背景，同时分析了进行区间组合预测的必要性。

The background of combination forecasting is illustrated, and meanwhile the necessity of interval combination forecasting is analyzed.

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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。

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.

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