Western countries always propagate the racist theories such as “wisdom differences between races” and “evolutionary struggle，” which has exerted a great influence on Japan’s cognition and actions against the outside world since modern times. Since defeating the Russians of “white race” in the Russo-Japanese War，Japan had been regarded as the “leader” and “savior” of colored races. However，as imperialist Japan accelerated the aggression and expansion，the so-called “liberation theory of colored races” became a propaganda tool used to conceal Japan’s aggression. Up to now，some Japanese still attempt to beautify their aggression history and deny the liabilities for war on the excuse of “ethnic liberation”. In addition，Japan’s argument is confusing and deceptive somewhat due to the one-sided and wrong historical cognition of some Southeast Asian people.