Based on the grey theory to indeterminacy, the GM (1,1) forecasting model to increase natural gas demand is established through dealing with sample data, and scale comparison.

• 运用不确定性分析法的灰色系统理论,经过样本数据处理、级比、级比界区检验,构建了天然气需求增长灰色系统预测模型GM(1,1)。