Judges' judgement has logical reasoning and value measurement model. Logical reasoning mode asks judge to use syllogism strictly,in which are dominated by rational factors. The value measurement mode should consider social environment,economic status,value concept in connection with the case,which will have irrational factors of judge inevitably. Logical reasoning and value measure model are combined with each other in the judicial application. The rational and irrational factors of judge are complement and mutual penetration,which affects jud...