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。