Abstract “On War”and“The Art of War”are classics of military studies, have a great impact on future generations. The two great works in the nature are about the principles and the uses of war, but “The Art of War”talks a lot about the national strategy, and“On War” talks about the military strategy more detailed. The contents of two great works are to study the war. The similarities of two works are “Dualism”of the philosophy and analytical frameworks on strategic are not much difference, the differences are“On War”put more emphasis on the interaction of war and politics,“Brave”is the first requirement of military and intelligence judgments is part of the dimension of war, however,“The Art of War”put more emphasis on the“Intelligence” and“Wisdom”is the most important, therefore, the intelligence is the base of all ideology. It is not easy to compare the two works, since the greatest advantage of“The Art of War” is concise, and the greatest weakness of“On War”is complex and obscure. Therefore, to understand the differences between the two works, we must use the sophisticated analysis and more in-depth reflection.