Abstract: While it is thought that Japan is a country deeply influenced by Confucianism of China,characters of Japan's Confucianism differs from that of China in many aspects with historical social structure changes of the two countries.It is reflected by The Warrior Family Precepts.Confucianism was spread to Japan in the early fifth century and accepted by the ruling class.In the age of Edo,Warriors' speaking and acting was cautiously self-disciplined and complied to courtesy.Combining with Confucian morality,self-discipline occupied a large part in the family precepts.It should be noticed that contents of Confucianism in Japan are not completely the same with that in China,owing to the different social conditions in two countries.