Li Jing was one of the founding heroes of the Tang Dynasty. He used troops according to local conditions and was good at using surprise troops. He fought in the north, south, east and west of his life, pacified rebellions, eliminated enemies, and made outstanding contributions to unifying the Tang Dynasty, consolidating border defense, and expanding territory.

However, Li Jing's official career was not smooth. In 605 AD, he served as the Magistrate of Mayi Prefecture and followed Li Yuan, the retaining general of Taiyuan, and Turkic for 12 years of war, but did not get promoted. The rebellion caused by the tyranny of the Sui Dynasty had already begun, and Li Yuan secretly recruited soldiers and horses to prepare for the rebellion. Li Jing sensed his plan and disguised himself as a prisoner to report to Emperor Yang Guang of the Sui Dynasty in Jiangdu.

When Li Jing was stranded in Chang'an, Li Yuan rose in rebellion and captured Chang'an, capturing Li Jing and preparing to execute him. Before the execution, Li Jing shouted loudly, "I, Li Gongshu, raised the banner of rebellion to eliminate the violence. Why not complete the great cause instead of killing heroes because of personal grudges?" Upon hearing these words, Li Yuan and Li Shimin admired his talent and courage and released him. Soon afterwards, Li Shimin summoned him to his command, and Li Jing began his amazing and magnificent military career.

Li Jing was not only good at commanding troops, but also emphasized summarizing military experience, forming systematic military thoughts and theories, and writing excellent military works. Unfortunately, his military works such as "Li Weigong's Military Strategy", "Liu Jun Mirror", and "Yu Zhang Jing" have been lost. However, there is a simplified version of "Wei Gong's Military Strategy" in "Tai Ping Yu Lan • Bing Bu", which records Li Jing's strategic thoughts in military governance, military operations, and reconnaissance.

Li Jing was also good at cultivating talents and was a deserving "godfather" in the Tang Dynasty army. Among the students recorded in historical books are Li Ji, Su Dingfang, and Hou Junji. Among them, Su Dingfang was the new generation of military god of the Tang Dynasty who later replaced Li Jing.

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