With the development of science and technology, the Internet as a kind of transmission mode in people’s life, which the importance of the impact is gradually expanding. Once as a positive force for society to make an important contribution to the network of public opinion is moving towards an extreme way, deviate from the desired path, gradually evolved into a terrible the 'violence' form. From the initial 'female cat abuse incident' to later 'stepmother child abuse' event, we can clearly see the negative effects of the Internet is a double-edged sword, the network public opinion began to openly challenge the traditional social moral bottom line. From the perspective of communication, we can see the reasons of this phenomenon, and the corresponding policy.