Abstract: Uncertain reasoning is an important work in current artificial intelligence research field. The cloud model can establish transformation of uncertainty between the qualitative concept and the quantitative description. I}hc rule generafor constructed by cloud model can describe qualitative rules expressing by natural language effectively, and carry out uncertain reasoning. Finally,an uncertain reasoning approach based on cloud model was used for forecasting electronic products lifetime under practical working conditions, which demonstrated the validity and practicability of the cloud rcaconing method.

Key words: Uncertain reasoning, Could model, Rule generator