The traditional realism is a kind of international relations theory with the remote idea resources .This theory produced by specific history environment in 20th century,leading international relations studies for 30 years nearly. This theory pay close attention to the essence of the international political and the actual situation of the country,view the international relations from the authority and the national interest angle . This theory enriched and developed the western international relations theory,put the positive influence on the diplomatic practice to the western nation. But,like a coin with two sides,this theory also inevitably has the flaw。 We must absorb the reasonable ingredient in the theory and to develop the China’s international relations theory.