Abstract: The concept and significance of tactics, techniques, and procedures (TTPs) are described from the aspects of tactical countermeasures and new equipment. Some key points of American army's TTPs are cited. Some classic examples of innovation on methods of operation by Chinese surface-to-air missile troops are introduced. Some methods and factors of air-to-ground attack by American air force are analyzed, including operational environment, target characteristics, mission planning, searching and tracking, operational coordination, weapon application and attack strategy, precise strike and damage control, tactics and techniques, cooperative engagement, etc. And the enlightenment on undersea warfare is discussed as well. It point out that TTPs are the methods and guidelines for effective organization and integrated application of operational resources, the bridge between operation and armament, and the linkage between tactics and techniques. They are very important for future weapon development and unmanned operations. The study of TTPs should be oriented to weapon application, pay attention to principle of development, and lay emphasis on basic research. It is necessary to understand modern operation rules at system level.