Abstract:Military Psychology is a discipline which aims to investigate how the servicemen‘s psychological process was affect in operation surroundings for the needs of military affairs. In this process, the subject takes military culture into account and seeks to resolve the problem which arises from combat and military operations. Military Psychology is one of the divisions having long history in international psychology disciplines, which is referred to as the “testing field” in applied psychology. The notable military psychologist Driskell had put it: “There are no other organizations or faculties like troop which is related to psychology and its development so closely.” This article introduces the origin, concept, major research domain, and the hot spot of military psychology. It also proposes the frame of the military psychological science including seven fields: military psychological selection, military ergonomics, special military surrounding and psychology, military leadership and organization, psychological surgeon and military clinical psychology, military stress, and psychological warfare. Since 2005, the information technology had been widely used in warfare, therefore, the military psychological aid and psychological health duty, psychological warfare and information technology, military personal and organizational psychological health, military surroundings and stress, military command decision making and military training in high tech are now becoming hot issues in Military Psychology which have received much attention of many countries.