Choice reversal is a paradox phenomenon in traffic behavior，and it can not be well explained through error cautious control． From the perspective of decision psychology，the judgment dimension system of option at- tributes，and carries out three groups of psychological experiments in different bus travel decision situation was es- tablished based on the equate-to-differentiate theory． Through the matching task，it was confirmed that choice can be explained under the equate-to-differentiate interpretation． Through the retest reliability analysis for choice con- sistency，it was proved that the judgment for dimension is variable． Through the retest reliability analysis for choice and matching consistency，it was proved that choice reversals are caused by the change of the dimension judgment in matching task． The equate-to-differentiate interpretation shows good consistency in the three groups of experiments． The judgment dimension system can predict and explain the travel choice reversal． That is，the in- explicable paradox occurs when diverse equate-to-differentiate strategy is used．