Taking advantage of the framework of the‘Private Account’and‘Public Account’，this paper designs four experiments to study the effect of information disclosure mechanism (IDM) on reducing free riding behaviors and to study the stability of IDM．The first experiment is without IDM，the second one is with weak IDM，the third one is with strong IDM and the last one is with repetitive strong IDM．In addition，this paper uses FRI to measure the degree of severity of free riding，and uses Z two-tailed test to analyze data from the experiments．The results show that: ( 1) IDM has significant influence on free riders，while the influence of the strong IDM is more intense than that of the weak IDM; ( 2) the effect of IDM depends on its types，namely the profit-oriented IDM is more likely to trigger free riding while the restriction-oriented IDM has reduce it to some extent because of self-punishers who emerge under the condition of the restriction-oriented IDM; and ( 3) the effect of IDM on reducing free riding is not only unstable but also limited．