With the rapid development of space information technology and constant advancement of militarization of outer space, the legal aspects of information operations in outer space have aroused the attention of international community. Information operations in outer space have brand-new features and means, which are apparently different from those of traditional operations, thus challenging almost all major aspects of the traditional principles of the warfare law . This paper makes a pilot study on challenges to the traditional principles of the law of war against the background of information operations in outer space from the following three aspects of the regulations in the law of war: Jus ad Bellum, Jus in Bello and neutrality.