Abstract: The paper studied the research status of multi-layer state-space modeling method,and analysed its advantages and disadvantages．Furtherly,it developed the modeling method with could model and put forward the multi-layer intelligent state-space modeling method,which is able to effectively solve uncertainty of system information,especially coe-xistence of fuzziness and randomness．And it described specification of the model and its intelligent information processing scheme．Finally,it was used to analyse China’s energy system and expound the solution method,and the simulation platform was developed to complete comparison experiment．An active result was got,which shows the method is simple and effective.

Key words: Multi-layer state space model,Cloud model,Uncertainty,Complex large system