Polynomial curve fitting is a usually used data fitting method. When there are too many data for fitting, only just one polynomial curve function cannot acquire good fitting effect.
多项式曲线拟合是一种较常用的数据处理方法，但当数据点较多时，只采用一种多项式曲线函数拟合所有数据点难以取得较好的拟合效果。
An actual example is taken to illustrate that fitting precision of separated period is 17 ~ 28 times larger than non-separated period and the fitting of separated period has good effect.
作者以实例说明分周期的拟合精度是不分周期拟合精度的17 ~ 28倍，并且分周期拟合具有较好的拟合效果。
We use it to fitting 1848-2002 sunspot data. The effect is good.
用它拟合1848 - 2002年太阳黑子相对数数据，取得很好的效果。
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