This paper inserts grey system, makes use of finite time series, follows GM (1, 1) building method, builds the long term prediction model of total waste -water in Heilongjiang Province.

本文引入灰色系统理论，利用有限的时间序列，按照GM(1,1)建模方法，建立起黑龙江省污水总量长期预测模型。

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During this term, you can learn the courses through courseware as long as you like instead of face-to-face teaching method with a limitation of only one-time attendance.

学习期内可不限时间、次数重复点播学习，打破了常规面授只能听一次的局限性；

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A new method of the medium term electric load forecasting according to time period forecasting tendency is given and meanwhile the multistep medium term load model is put up forward.

对电力系统中期负荷预测提出了按照时间段预测趋势修正的新方法，同时提出了多阶梯中期负荷模型。

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