Abstract: Military geology and related knowledge have been playing an important role in military affairs and have created lots of mir-acles. The modern information war has the deep-land, deep-sea and deep-air characteristics. The demand of environment utiliza-tion and estimation of wars, the choice and scheduling of targets, and the estimation of the war's influence on living environment be-come more and more important. The solving of these problems needs knowledge intimately related to geology. In this paper, the au-thors carded the application of the knowledge related to geology to military affairs and, in combination with the characteristics and de-mand of modern war, systematically defined the definition, content and direction of military geology, investigated the connection and difference of different disciplines in military affairs and, on such a basis, put forward the three forms of civilians-military integration:civilians for military affairs, military affairs for civilians and dual-use technology, thus providing thoughts for the fundamental civil-ians-military geology integration and military geological research.