In China,the farmers' interests expression appertains essentially to the passive one to protect their rights and interest.The potential danger exists in the action of expression with a non-institutionalized trend at the beginning,and the increasing feeling of farmers' mutual deprivation and the individualization of interests expression exacerbate this sort of tension;the invalidity of institutionalized expression is the direct reason for the farmers tending to non-institutionalized interests expression;the relative efficiency of non-institutionalized expression is the psychological basis for the farmers proceeding non-institutionalized expression.This paper points out the reasons mentioned above result in the matter of non-institutionalized interests expression for many farmers.