By analysing the differential equation of GM(1,1), this paper gives an unbiased GM(1,1) model and proposes a new method of estimation of the GM(1,1)model parameters.

通过分析GM （1，1）白化方程的解析表达式 ，建立了无偏的GM （1，1）模型 ，给出了估计模型参数的新方法。

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Unbiased estimation for the two parameters of the special model is proposed and improved by covariance adjustment approach, separately.

对两个参数各提出了一个无偏估计并采用协方差改进法分别对其作了改进。

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