Abstract: The open,free and virtual characteristics eliminate the boundary of network friendship,which fea- tures wider scopes,easy atmosphere and low costs.Moreover,more space for imagination is left for the parties concerned.Network friendship can be classified into diverse types depending on status,mode and purpose. However,because of said characteristics,many problems emerge,such as betrayal of privacy,distortion of mo- rality and personality,loss of credibility and shock to the traditional values of marriage,etc...

Key words: network, networkfriendship, ethicalnorms