The type of warfare has been changed in decades. The first strike by computer is not beyond possibility in the future. The cyber-war will be one of the most important key factors to affect the result of a war. The same knife cuts bread and fingers. Technology brings a new method to improve the ability of the network and makes the transmission of computer data be faster but has gravitated into a cyber attack.Although the procedures of information security protection have been set up in the military, those actions are not enough to catch up the change of invention of virus. Attending the relative computer emergency readiness team organizations and technical security conferences in the world is a quick and effective means to advance our understanding of information security learning.The responsibility of information security is not only for information persons also for military staff. All the mechanism of information managements can solve a temporary solution to a problem. The user's proper behavior in thinking and doing is the best way to reduce the chance of divulgence. The culture of obeying rules should be formed in everybody's mind.