The modelling methods of old information model,new information model,equal dimension new information model and modified model of residual based on GM(1,1)are introduced; the equal dimension new information model and the modified model of residual are set up separately.According to the result and the trend of the data,we think that the result by the modified model of residual could represent the inherence of the data.The two models are obviously different at the aberrant point,but the data show the modified model of residual is more actual in details.