Abstract: In our current transformation society, it is a process in which humanity is liberated and irrationality of humanity resuscitates by the market economy. Pursuing maximum benefit, it will not only make market economy prosperous, but also breed the expansion of irrationality. There is defect of system, rational causation and irrational causation during the process of corruption spread. In this paper, we have analyzed some irrational causation of corruption spread such as expansion of desire, impurity of motion, offside of consanguineous emotion, weakness of will, collective unconsciousness and comedown of communist belief. Irrationality plays important roles in corruption and anti-corruption.