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本文把用ＦＦＴ获取的频率特性模型与预期频率特性相比较，取得控制器的频率特性．用最小二乘法将其拟合成传递函数模型．文中用实例验证这种拟合的精度是令人满意的．
In this paper, the frequency characteristic model obtained by FFT is compared with the expected frequency characteristics to obtain the frequency characteristics of the controller. It is fitted to the transfer function model by least square method. In this paper, an example to verify the accuracy of this fitting is satisfactory.