The purpose of this study was to investigate the effect of single forewarning of the first-step disguised persuasion and the effect of double forewarning both of the first-step disguised and of the second-step concealed persuasion on the disguised persuasion in Experiment 1, and the mediating processes of those effects measuring thoughts by thought-listing method in Experiment 2. Results showed that double forewarning produced resistance to persuasion more than single one did, and that double forewarning produced negative thoughts more than single one did in the postwarning-premessage period.