Based on the premise of optimized background value,according to bad robustness of estimating parameters of traditional grey GM(1,1) model based on least square method,this paper presents a new algorithm of total least absolute deviation for estimating parameters of grey GM(1,1) model with optimization of initial value,and an optimized grey GM(1,1) model is put forward based on simultaneous optimization of background value,initial condition and model parameters.Lastly,a calculation example illustrates the fe...