Tian Pian (about 370 BC-29 BC1year), also known as Guang, is called "Tiankouqing". Qi (now Linzi, Shandong) people. Thinkers and philosophers in the Warring States period. Tian pian is the backbone of Taoism in Linzi, Qi State. Historically, he was so eloquent that he "refused to be an official". During the Warring States period, a hundred schools of thought contended very actively. In the State of Qi, starting from Qi Weiwang's father Qi Huangong, Gong Xue was set up in the capital city of Linzi (now the north of Linzi, Shandong Province), attracting scholars, tourists and other talented people from all over the country to discuss, give lectures and write books. Because their status is inferior and they are protected and respected by Qi, the person invited to give a lecture is called "Mr.". Tian Pian was one of the "Mr. Xia Ji" at that time. Zhuang Zhou equated him with Mo Zhai, Bird Slippery, Shinto and Guanyin in Tianxiapian. At that time, the establishment of Jixia Xuegong, where Tian Pian was located, was actually a staff team of Qi State participating in and discussing state affairs. They wrote their own books and talked about "the matter of chaos control" in order to be the king of Qi. The king of Qi valued them very much. From Shen Dao down, they are called "doctors" every day, paving the way for them, and pampering them with "halls and mansions", saying that "seeing princes and guests all over the world can make the world wise." The conditions are very generous. In the specific environment at that time, it played a positive role in promoting a hundred schools of thought to contend and prospering academics. Compared with other countries, Xia Ji School has played a great role. At the same time, it also strengthened the reputation of Qi. At that time, all countries regarded Qi as a country that made great efforts to govern and treated corporal with courtesy. Among the schools of giving lectures, Huang and Lao have the upper hand and are most valued and welcomed. The Yellow School and the Old School are important factions of the feudal landlord class to discuss politics and implement policies. It transformed and absorbed some ideological materials of Taoism, and was founded by the legendary Huangdi and Lao Dan. Therefore, it is also called "Huang Lao School". Qi Weiwang's reform, in a sense, was carried out under the guidance of this school. At that time, Tian Pian, Song Shuo, Yin Wen, Yuan Huan (or Yan Yuan) and meson (or meson) expressed their opinions and took their own strengths. Among them, Tian Pian is good at argumentation, especially argumentative essays. Therefore, people call him Taguchi.

Shen Dao, a native of Zhao, originally studied Taoism and was a representative figure of Legalism separated from Taoism. Qi Xuanwang and Wang Qimin studied in Xia Ji and gave lectures in Jixia Academy for many years. Many students have been giving lectures for a long time, which is helpful for the spread of legalist thought in Qi State.

Yin Wen (about 360 BC-280 BC) was a native of Qi. A famous philosopher in the Warring States period. As famous as Song Shuo, he belongs to the Taoist school in Xia Ji. Their thoughts are harmonious and have a far-reaching influence on later Confucianism. Yin Wen lived in Xia Ji when he was in Qi Xuanwang, and he was a representative of Xia Ji School. He was a famous scholar at that time, as well as Song Shuo, Meng Peng and Tian Pian. His classmate was Gong Sunlong. Gong Sunlong was a famous master at that time, and he was eloquent. "A white horse is not a horse" is a representative argument, and he is famous for his sophistry. Yin Wen's theory was highly praised by Gong Sunlong at that time.

Zou Yan (about 340 ~ 260 BC, also known as 305 ~ 240 BC) also wrote poems. At the end of the Warring States period, it is said that the cemetery of the people of Qi was in Haozhuang, Xianggongzhuang Town, Zhangqiu. During the Warring States Period, Xia Ji and Gong Xue, a famous school of Qi, were an important stage for a hundred schools of thought to contend. Zou Yan is a famous scholar in Jixia Academy. He is rich in knowledge and "talks about things." Sima Qian listed him as the first of Xia Ji's philosophers in Historical Records, saying that "Yan Yan's skill is great and heroic". Zou Yan has been to Zhao, Wei, Yan and other vassal states, and was treated with courtesy by monarchs of various countries.

Zou Yan initiated the Yin-Yang School in the Warring States Period, and his main ideas were "Five Virtues in General" and "Great Kyushu". He linked the five elements theory popular in the Spring and Autumn Period and the Warring States Period with the changes of society and the rise and fall of dynasties, and put forward the historical view of "five virtues and constancy". He believes that the whole material world is composed of gold, wood, water, fire and earth, and the development and change of things are realized through the interaction and coexistence of the five elements. Dynasty alternation in the history of human society is as objective as nature. Since ancient times, human society has been circulating in the order of five virtues transfer. Every dynasty has a virtue, and every virtue has its ups and downs. In its heyday, its corresponding dynasty flourished; If it goes on, this dynasty will perish. The historical changes of human society follow the law that the five elements coexist and resist each other. This theory had an important influence on Qin and Han societies. In understanding the space, Zou Yan founded the theory of "Great Kyushu". Being close to the sea inspired his association with the vast universe. Zou Yan believes that China, as mentioned by Confucianism, accounts for only one eighty-first of the world. China called Chixian China. There is Kyushu in Chixian Shenzhou, which is divided by danger, while there is Kyushu like Chixian Shenzhou outside China. Each state is surrounded by the sea, and each state has its own Kyushu, so the language and customs are different. This inferential assumption about world geography is of great significance to broaden people's geographical horizons at that time and later.