After three generations of the Duke of Qi Wen, he was the Duke of Qi, who successively formed an alliance with the Duke of Zheng Zhuang and the Duke of Lu Yin. Due to the help of Zheng Guo and Lu Guo, during his reign, Duke Xi presided over many multinational alliances and quelled the struggle between Song, Wei and Zheng. The state of Qi also united with the states of Zheng and Lu to crusade against the state of Song on the grounds that the Duke of Song did not make a pilgrimage to the emperor of Zhou, and on the grounds that the state of 郕 (chéng) did not obey the orders of the emperor of Zhou. The state of Qi also pacified the state of Xu, forced the Duke of Xu Zhuang to flee, and quelled the rebellion of the Huadu of the Song state.

In 706 BC, the Duke of Qi defeated Beirong with the help of Zheng Guo's son, Hu, but because of the gifts given to various allies, Lu and Zheng were at odds. In 702 BC, the state of Qi attacked the state of Lu together at the request of the state of Zheng. In 699 BC, at the request of the Song State, the State of Qi united the three kingdoms of Song, Wei and Yan to crusade against the State of Zheng. In this way, the Qi State formed a situation of a small hegemon.

Behind the Duke of Qi is the Duke of Qi Xiang, who is not only reckless, but also shameless. During the reign of Xianggong, he fought abroad for many years. In the fourth year of Xianggong, there was a civil strife in Zheng State, and Xianggong took the opportunity to send troops to attack Zheng Guo and killed Zheng Guo's powerful minister Gao Qumi. In 693 BC, the State of Qi attacked the State of Ji under the pretext that the Marquis of Ji had slandered in front of Zhou Tianzi, and the State of Ji surrendered, and three years later Xianggong destroyed the State of Ji. After that, Xianggong sent troops to defend the country, killed the left and right sons of the country, and helped Wei Huigong to restore the throne. During the 12 years of Xianggong's reign, he fought almost every year.

In addition to showing off his strength, Qi Xianggong was also addicted to wine. As early as when he was the crown prince, he had trouble with his sister Wen Jiang, and later Wen Jiang married Lu Huangong. In 694 BC, Xiang Gong recruited Wen Jiang, who had become the wife of Lu Huan at that time, back to Qi State, and after Lu Huan discovered the scandal between Xiang Gong and Wen Jiang, Xiang Gong sent someone to kill Lu Huan Gong. Finally, in 686 BC, the doctor Lian Cheng and Guan Zhifu mutinied, killed the Duke of Qi Xiang, and then proclaimed Gongsun Wuzhi as the monarch.

The ancients called a brother who shared a great-grandfather but not a father, and was younger than himself, as a younger brother, if he did not share a grandfather, he was called a grandfather, and if he shared a grandfather, he was called a brother. Gongsun Wuzhi is the younger brother of Qi Xianggong, and his father is the half-brother of Qi Xianggong. Gongsun Wuzhi was deeply loved by the Duke of Qi, so when Gongsun Wuzhi was alive, he was treated the same as other sons. When Qi Xianggong was the crown prince, he especially hated Gongsun Ignorance, and after he ascended the throne, he immediately drove away Gongsun Ignorance and took away his son's treatment. Gongsun Wuzhi was deeply dissatisfied with this, but he knew the tyranny of Qi Xianggong, so he had to choose to endure and wait for the opportunity.

Xianggong had no way, and the sons fled one after another. Bao Shuya, the doctor of the Qi State, protected Gongzi Xiaobai and fled to the state of Ju (jǔ), while another doctor, Guan Zhong, assisted Gongzi in escaping to the state of Lu. In 685 B.C., the ministers of the state of Qi killed the emperor of Ignorance and the Imperial Doctor. There is no monarch in the country, Gongzi Jiu and Gongzi Xiaobai rushed back to China after learning the news, Lu sent Guan Zhong to lead troops to block the road from Ju to Qi, Guan Zhong shot an arrow on the hook on Xiaobai's belt, Xiaobai pretended to fall to the ground and died, Guan Zhong then sent someone back to Lu to report the victory. At this time, Xiaobai had already rushed back to Qi and became the Duke of Qi after ascending the throne.

After Duke Huan of Qi ascended the throne, he immediately sent troops to meet the Lu State, and the Lu army was defeated after the battle. Uncle Bao wrote a letter to Lu Zhuanggong, in which he said: Gongzi Jie is the brother of Qi Huan Gong, Huan Gong can't bear to kill him, and asks Lu Guo to kill Gongzi Jie; Gongzi Jiu's teacher Zhao Hu and Guan Zhong were the enemies of Duke Huan, and asked Lu Guo to send them back, and the Huan Guild would personally dispose of them; If you don't obey your orders, Qi will send troops to attack Lu. Lu Jun was very frightened when he saw the letter, and immediately killed Gongzi Jiao, Zhaohu chose to commit suicide, and Guan Zhong was imprisoned by Duke Huan.

Bao Shuya recommended Guan Zhong to Duke Qi Huan, but Duke Huan never forgot Guan Zhong's one-arrow hatred, Bao Shuya comforted: The minister was lucky to follow the king, and the king has now become the monarch; If the monarch only wants Qi to become a strong country, then Shuya and Gao Wei are enough; If the monarch wants to achieve the hegemony of the world, then he must be in charge; Whichever country Guan Zhong goes, which country will be strong, you can't lose him! Duke Huan finally followed Uncle Bao's advice and talked to Guan Zhong about the way of the overlord, and Guan Zhong's insights made Duke Qi Huan overjoyed. So Duke Huan ordered Guan Zhong to be the doctor and entrusted him with an important task.

Guan Zhong carried out reforms and implemented the system of integrating the military and the government and the army and the people, which made the Qi State gradually stronger. In 681 BC, Duke Huan convened an alliance of princes of Song, Chen and other four kingdoms in Zhendi, and Duke Huan of Qi was the first prince in history to act as the leader of the alliance. Later, the Song State violated the covenant, and the Duke of Qi Huan, in the name of Zhou Tianzi, led the princes to crusade against the Song State, forcing the Song State to sue for peace with the Qi State. In order to stabilize his position as the overlord of the Spring and Autumn Period, Duke Huan of Qi annexed those small vassal states surnamed Jiang and established a whole Great Qi State.

Duke Huan also built a cypress bed platform about 35 miles north of the capital, which was used for meeting alliances and sleeping in the line. At that time, the princes of Central China suffered from the invasion of Rong Di and other tribes, so the Duke of Qi Huan played the banner of "respecting the king and conquering the country", attacked Shanrong in the north and attacked Chu in the south. Duke Huan became the overlord of the Central Plains and was rewarded by Zhou Tianzi, and the hegemony of Qi also reached a peak.

In his later years, Duke Huan was politically mediocre, and he reused Yu Chenwei Kaifang, Yi Ya, Ji Diao and others. When Guan Zhong, Bao Shuya and other virtuous ministers died one after another, the Qi State also began to decline. In order to compete for the throne, the princes are also their own henchmen. Duke Qi Huan and Guan Zhong made Gongzi Zhao the crown prince, and asked Song Xianggong to take care of Gongzi Zhao. In 643 B.C., Duke Huan of Qi was seriously ill, and the five princes, Gongzi Wuqi, Gongzi Zhao, Gongzi Pan, Gongzi Yuan, and Gongzi Shang, each led their henchmen to compete for the throne. The five princes attacked each other, causing chaos in the Qi country, and the Duke of Qi Huan was also starved to death. Later, Yi Ya, Ji Diao and others supported Gongzi as the monarch of Qi without loss, and Gongzi Zhao fled to the Song Kingdom.

In 642 BC, Song Xianggong united with Cao State, Wei State and other countries to lead troops to attack Qi State to help Gongzi Zhao return to the country and compete for the throne. In March, under the pressure of the princes' army, the doctors of the Qi State, under the leadership of the Guo clan and the Gao clan, booby-trapped and killed Ji Diao and Wu Wu, and came to meet the crown prince Zhao. However, the followers of the remaining four princes later raised troops to attack Prince Zhao, who had already entered the territory of Qi, forcing Prince Zhao to flee back to Song. In May of the same year, Song Xianggong sent troops again and defeated the princes of Qi, and Prince Zhao returned to Qi to take the throne as the Duke of Qi. After this turmoil, the national strength of Qi declined, and the hegemony of Qi Huan came to an end.

After the death of Duke Xiao of Qi, his son was killed by Wei Kaifang, and his son Pan seized the throne as Duke Zhao of Qi. After the death of Duke Zhao, his son She, who reigned for only five months, was killed by Gongzi Shang, and then Gongzi Shangshang established himself as Qi Yigong. Four years later, Duke Yi was killed. The Qi people hated the arrogance of Duke Yi, abolished the son of Duke Yi and set up Gongzi Yuan to ascend the throne as Duke Hui of Qi. The series of battles for the throne has finally come to an end, and the national strength of the Qi State is not as good as before, so it can only follow the Jin State and the Chu State to compete for hegemony.

After the death of Duke Hui of Qi, the state of Qi weakened day by day. During the reign of Qing Gong, the Qi army was defeated by the Jin army. During the reign of Linggong, he crusaded against the Lu State five times, but there was no result. At this time, the Jin State has become the overlord of the princes, and the Jin State led the 12 princes of the Lu State and the Song State to attack the Qi State on the grounds that the Qi State betrayed the Jin State and crusaded against the Lu State, and the Qi Linggong personally led the army to resist the enemy, but the result was defeated.

During the Spring and Autumn Period, Zhou Tianzi named the Guo and Gao clans surnamed Jiang in the Qi State, and the Guo clan and the Gao family assisted the Lu family surnamed Jiang to guard the Qi State. The Guo clan and the Gao clan have been the secretaries of the Qi State for generations, taking turns to govern, and the Guo and Gao clans are also known as the two guards of the Qi State. The appointment of the second guard of Qi was directly granted by Zhou Tianzi, and all the government affairs of the state of Qi were jointly adjudicated by the second guard of Qi and the surname of Jiang Lu. Later, the Qi State appeared Bao's, Cui's, Qing's, Yan's, Gao's, Luan's and other Qing doctors in power. The power of the Qing doctors became more and more powerful, annexed each other, and even began to depose the monarch of the Qi State.

The Duke of Qi Huan was established by Gao Jie, and Cui Zhu Yingli established the Duke of Qi Zhuang to ascend the throne, killed Gao Hou, the descendant of Gao Jie, and took charge of the government alone. Later, because Zhuang Gong and Cui Zhu's wife had an affair, Cui Zhu was furious, so he united everyone to kill Qi Zhuang Gong, and later established Zhuang Gong's younger brother as the monarch of Qi State, that is, Qi Jinggong. In 546 BC, Zuo Xiangqing attacked and destroyed the Cui clan, and Cui Shu committed suicide. In 545 BC, the Bao, Gao, and Luan clans united to attack and destroy the Qing clan, and Qingfeng fled to the state of Wu. Since then, the state of Qi has been presided over by the doctor Yan Ying. Yan Ying lived a frugal life, a corporal of courtesy, and internally he supported the national government, repeatedly advised Jing Gong, and promoted talents; Externally, he went to other countries, was clever and fickle, and lived up to his mission, making the Qi country famous among the princes.

In 532 BC, the Luan and Gao clans were jointly destroyed by the Bao and Tian clans, and Luan Shi and Gao Qiang fled to the Lu state, and the power of the Qi clan was greatly weakened. Tian is a descendant of Chen Ligong, and his ancestor is Tian Wan. Because Tian Wan was ostracized in the Chen State, he went into exile in the Qi State and was appointed by the Duke of Qi Huan. After Tian Wan, the fifth generation came to Tian Qi, and the Tian family benefited the people, and the people's hearts slowly returned to the Tian family, and the power of the Tian family slowly became stronger. Yan Ying once secretly said to the virtuous uncle of the Jin State: The power of the Qi State will fall into the hands of the Tian family sooner or later.

A descendant of the Tian family, Tian 穰苴 (rángjū), was appointed Grand Sima for defeating the armies of the Jin and Yan states, and the Tian clan's power further expanded. Gao Zhang and Guoxia, who were particularly vigilant about this, spoke ill of Tian Sui Tho in front of Qi Jinggong, and Tian Sui Tho was finally dismissed. Tian Qi faced the slander of the Gao clan and the Guo clan and was determined to get rid of them. In 500 BC, Yan Ying died, and the government of Qi was controlled by the Tian and Gao clans. In 489 BC, Qi Jinggong was seriously ill and left a testament to Guoxia and Gao Zhang, to appoint the young son Tu as the crown prince and expel the other princes. Soon after, the Tian clan staged a palace coup d'état, destroying the Gao and Guo clans, Gao Zhang was killed, Guoxia fled to Ju, and Yan Ying's son Yan 圉 (yǔ) fled to Lu.