Abstract: Qualitative reasoning based on cloud model implements uncertainty reasoning by constructing cloud regulation generators.But the traditional two-dimensional cloud reasoning methods do not take notice of the interaction between the condition clouds,as an improvement on the traditional method ,a new approach to planar cloud reasoning method based on related condition clouds were suggested in this paper,which was followed by the focus on the product of cloud droplets and the construction of corresponded regulation generators.Then this new approach was applied in the prediction of GDP of America.The prediction results show that the new approach outperforms the traditional one,which indicates that the new method is feasible and effective,and to some extent remedies the shortcomings of traditional way.

Key words: Uncertainty reasoning,Related conditional cloud,Regulation generator,Prediction of information