The expansion of computer networks has lead to the increase of online network attacks. Therefore, an efficient method to detect and analyze network attacks is inevitable. As a result much research has been done on network visualization. This paper proposes a method which efficiently visualizes and analyzes network attacks using parallel coordinates. A brief review on the limitations on previous visualization methods and a structure which can analyze network attacks through visualization will be presented. Moreover, experimental results on visualization of scanning attacks, denial of service attacks and spoofing attacks using multi parallel coordinates will be shown.