The problem of copyright infringement has always been a focus of concern of copyright owners and law enforcement units. P2P (peer-to-peer) software is one of the major ways to acquire unauthorized files on campus. In the 96th academic year, The Ministry of Education proclaimed the prohibition against P2P software using, issuing governmental documents to request every university to restrain students from using P2P software and to promote related measures. As an effect analysis to the P2P software restrain this time, this study had conducted an investigation and an analysis according to the above background, trying to find the perceptions of the students under the contol, and to explain how these perceptions impact the behavior intention on. This study is revealing that though anti-P2P campaigns generally influence every perception like subjective norm, perceived risk, moral judgment, knowledge of copyright (the mediating variables) of the students, there is only an evident effect of moral judgment on behavior intention. As for the effects of other perceptions, they are not prominent. The study¡¦s result can provide schools with not only some practical suggestions concerning how to plan restrain strategies, but also a resource of references to develop campus piracy model for following researchers.