So many different philosophies developed during the late Spring and Autumn and early Warring States periods that the era is often known as that of the Hundred Schools of Thought (). From the Hundred Schools of Thought came many of the great classical writings on which Chinese practices were to be based for the next two and one-half millennia. Many of the thinkers were itinerant intellectuals who, besides teaching their disciples, were employed as advisers to one or another of the various state rulers on the methods of government, war, and diplomacy.

The body of thought that had the most enduring effect on subsequent Chinese life was that of the School of Literati (ru or ), often called the Confucian school in the West. The written legacy of the School of Literati is embodied in the Confucian Classics ( -- , , , , and from which the period derived its name), which were to become the basis for the order of traditional society. Confucius (551-479 B.C.), also called Kong Zi, ( ) or Master Kong, looked to the early days of Zhou rule for an ideal social and political order. He believed that the only way such a system could be made to work properly was for each person to act according to prescribed relationships. "Let the ruler be a ruler and the subject a subject," () he said, but he added that to rule properly a king must be virtuous. To Confucius, the functions of government and social stratification were facts of life to be sustained by ethical values. His ideal was the junzi ( or ruler's son), which came to mean gentleman in the sense of a cultivated or superior man.

Mencius (372-289 B.C.), or Meng Zi ( ), was a Confucian disciple who made major contributions to the humanism of Confucian thought. Mencius declared that man was by nature good. He expostulated the idea that a ruler could not govern without the people's tacit consent and that the penalty for unpopular, despotic rule was the loss of the "mandate of heaven."

The effect of the combined work of Confucius, the codifier and interpreter of a system of relationships based on ethical behavior, and Mencius, the synthesizer and developer of applied Confucian thought, was to provide traditional Chinese society with a comprehensive framework on which to order virtually every aspect of life

There were to be accretions to the corpus of Confucian thought, both immediately and over the millennia, and from within and outside the Confucian school. Interpretations made to suit or influence contemporary society made Confucianism dynamic while preserving a fundamental system of model behavior based on ancient texts.

Diametrically opposed to Mencius, for example, was the interpretation of Xun Zi ( ca. 300-237 B.C.), another Confucian follower. Xun Zi preached that man is innately selfish and evil and that goodness is attainable only through education and conduct befitting one's status. He also argued that the best government is one based on authoritarian control, not ethical or moral persuasion.

Xun Zi's unsentimental and authoritarian inclinations were developed into the doctrine embodied in the School of Law ( or fa), or Legalism. The doctrine was formulated by Han Fei Zi ( d. 233 B.C.) and Li Si ( d. 208 B.C.), who maintained that human nature was incorrigibly selfish and therefore the only way to preserve the social order was to impose discipline from above and to enforce laws strictly. The Legalists exalted the state and sought its prosperity and martial prowess above the welfare of the common people. Legalism became the philosophic basis for the imperial form of government. When the most practical and useful aspects of Confucianism and Legalism were synthesized in the Han period (206 B.C.-A.D. 220), a system of governance came into existence that was to survive largely intact until the late nineteenth century. Taoism ( ), the second most important stream of Chinese thought, also developed during the Zhou period. Its formulation is attributed to the legendary sage Lao Zi ( or Old Master), said to predate Confucius, and Zhuang Zi ( ) (369-286 B.C.). The focus of Taoism is the individual in nature rather than the individual in society. It holds that the goal of life for each individual is to find one's own personal adjustment to the rhythm of the natural (and supernatural) world, to follow the Way (dao) of the universe. In many ways the opposite of rigid Confucian moralism, Taoism served many of its adherents as a complement to their ordered daily lives. A scholar on duty as an official would usually follow Confucian teachings but at leisure or in retirement might seek harmony with nature as a Taoist recluse. The Taoist approach to life is embodied in the classic Dao De Jing ().

Another strain of thought dating to the Warring States Period is the school of yin-yang ( ) and the five elements. The theories of this school attempted to explain the universe in terms of basic forces in nature, the complementary agents of yin (dark, cold, female, negative) and yang (light, hot, male, positive) and the five elements (water, fire, wood, metal, and earth). In later periods these theories came to have importance both in philosophy and in popular belief.

Still another school of thought was based on the doctrine of Mo Zi ( 470-391 B.C.?), or Mo Di. Mo Zi believed that "all men are equal before God" and that mankind should follow heaven by practicing universal love. Advocating that all action must be utilitarian, Mo Zi condemned the Confucian emphasis on ritual and music. He regarded warfare as wasteful and advocated pacificism. Mo Zi also believed that unity of thought and action were necessary to achieve social goals. He maintained that the people should obey their leaders and that the leaders should follow the will of heaven. Although Moism failed to establish itself as a major school of thought, its views are said to be "strongly echoed" in Legalist thought. In general, the teachings of Mo Zi left an indelible impression on the Chinese mind.

Another good source of information about Chinese philosophy on the web can be found in the Chinese Philosophy page by Su Tzu.