The form of war refers to the external manifestation of the combined representation of various elements of war, such as the nature of war, countries and peoples involved, organization of armed forces, operational guiding principles, operational implementation and modes, within a certain period of time or space. The development of the form of war is influenced by factors like politics, economy, technology and strategy. Currently the form of war has become informationized, and the 1991 Gulf War was a critical turning point. Facing such a development in the form of war, the R.O.C. Armed Forces should keep cultivating talents, establishing asymmetric warfare capabilities, and innovating military theories, in order to cope with the change in the form of war. Also, it must keep paying attention to China's cognition and practice of future form of war. in order to predict China's military development as well as its cross-strait operational modes.