Abstract：The computer network constantly improves the level of informationization, and the situation of information security is still not optimistic.Aimed at the serious threat of ferry Trojan using removable storage media to disseminate virus and to attack the current network environment, we studied the traditional protection technologies by the analysis of the start, hide and run of this Trojan.The protection technologies include prohibiting or turning off autoplay, modifying permission, obtaining the immunity for autorun file, controlling removable storage devices, and completely removing sensitive files.To improve the virus protection of State Grid Corporation of China, we proposed a new idea for ferry Trojan protection by using the file tab from the standpoint of credibility of acquiring and implementing files.

Keyword：ferry Trojan;protection technologies;file tab;