Abstract: Zadeh's CRI method is applied in fuzzy reasoning wildly, but it has been criticized to be too complex and it is not consistent. To alleviate CRI method's drawback,Triple I Method was proposed by Professor Wang Uuojun. Now,Triple I method is widely recognized as one of the most important fuzzy reasoning methods, and many existing fuzzy inference methods are based on it. Despite Triple I method's success in various research fields, it still has no effect on fuzzy control. This paper analyzed I}riple I method. The results show that Triple I method has some drawback and it cannot be applied in control.

Key words: Fuzzy inference,CRI method,Triple I method,Implication operator