The early official positions were basically monopolized by nobles, but in the Spring and Autumn Period and the Warring States Period, the situation changed. Competition among countries is fierce, and the essence of competition is to compete for talents. Talents are not necessarily completely among the nobles, and the people are also crouching tiger, hidden dragon. At this time, regardless of family background, all countries choose talents with high standards and high treatment. Moreover, not only the country selects talents, but also some senior officials and aristocratic children have trained a large number of talents. The idiom "Mao Sui recommends himself" comes from one of the diners named Mao Sui.

At that time, people who read some books and wanted to make a difference really volunteered to find jobs themselves. Su Qin, a military strategist who embraced the six countries during the Warring States period, was born in a peasant family, but he learned a skill, so he volunteered to the kings. Unexpectedly, he was appreciated by any king. Jin Jin went home, thirsty, his wife refused to cook for him, and his sister-in-law ignored him. He bowed his head in anger and studied hard, and finally succeeded in one fell swoop. He went to lobby the prince and was entrusted with an important task. Su Qin is a successful example of active door-to-door recommendation through her own ability. Of course, there are also unsuccessful ones. As we all know, Confucius is a famous thinker and educator. He also traveled around the world with his disciples, recommended himself, wanted to get public office and publicized his political ideals. However, because his theory did not meet the needs at that time, Confucius failed to apply for a job.

Job hunting depends on recommendation and lasts for a long time. Some are selling from door to door, and some are writing letters with great literary talent. For example, Dong Fangshuo of the Western Han Dynasty wrote to the imperial court to recommend himself, saying, "I will lose less parents and raise more brothers and sisters. Thirteen years of study, three winters of literature and history. Learn fencing. Learn "Poetry" and "Book" and recite 220,000 words. Learning/kloc-Sun Tzu's Art of War written by Sun Tzu and Wu in the 9th century, and reciting 220,000 words with the tools of war and the teaching of drums ... "In a short cover letter, Dong Fangshuo wrote down his learning experience, major, ideology and morality, which played a great role. He really got a high position in the imperial court and was very proud.