The network has become an integral part in college students learning life with the rapid development of internet technology. Because the network has open, democratic, occult, random characteristics, it becomes an important channel for college students to express their emotions. Most of the college students have accustomed to making statements at will through BBS, Micro-blog, Post Bar and other cyberspace, so that they can achieve the purposes of the emotional communication, wreaking havoc and solving doubts. Although college students have a high knowledge of culture, most of them is relatively weak in the ethical awareness. It lies with the ethics education and social background. In the virtual network, college students will be prone to losing ethics in speech and behavior, especially in hot topics and sensitive issues. If the individual does not get the correct emotional counseling, the polarization effect of groups will result in widespread movements of network public opinion and the formation of the ethical behavior of groups of anomie, which will have a bad effect on the public.