As IoT connects the virtual with the real world,the original virtual attack on the Internet will cause real damage in the physical world.Cyber violence is no longer a new word now,but not much attention has been paid to it.In the poster,the Chinese character plays the leading role.The violent crime is seen through the crack of the Chinese character,which is produced by steel plate cut. In this way,people are reminded that the Internet should not be the dark corner where violence is advocated and bred and they should always say no to any such type of cyber violence.