When Song Jiang was attacking Jiangzhou, he passed by Jieyang Ridge. After Li Jun heard the news, he waited at the foot of the mountain with the Tong brothers, but missed Song Jiang. Song Jiang was drinking in Li Li's hotel, but was numbed by Li Li with sweat medicine and was almost killed. After waiting for a long time, Li Jun returned to the mountain to look for Li Li. He happened to encounter Li Li who was about to kill Song Jiang, so he rescued Song Jiang. Song Jiang stayed at Li Jun's house for a while and became brothers with him.
After Song Jiang left Jieyang Ridge, he rewarded Xue Yong, a diseased insect, in Jieyang Town. He offended the Mu Hong brothers and was chased to the Xunyang River by the Mu brothers and their villagers. In desperation, he boarded the black ship again. Zhang Heng sailed the boat to the center of the river to seize Song Jiang's property and force him to jump into the river. Li Jun happened to meet him in a boat and saved Song Jiang again. Song Jiang, Zhang Heng, Mu Hong and others turned enemies into friends.
Song Jiang wrote an anti-poetry in Jiangzhou and was reported by Huang Wenbing. He and Dai Zong were sentenced to beheading, but they were rescued by Li Kui and seventeen Liangshanbo leaders who robbed the execution ground. Li Jun, Zhang Heng, Mu Hong and other nine people also rushed to Jiangzhou by boat to rescue Song Jiang, but they met Song Jiang and others at the Bailong Temple on the riverside. A group of 29 people gathered at the Bailong Temple. Then they attacked Wuwei Army, and Li Jun assisted Zhang Shun in capturing Huang Wenbing alive. After Li Jun went up the mountain, he and Li Kui guarded the dry village in front of the mountain. Later, Zhujiazhuang, Gaotangzhou, Qingzhou, and Huazhou were conquered.
When Song Jiang became the leader of Liangshan, he readjusted the responsibilities of generals and assistants. Li Jun changed the town of Shuijunzhai and ranked first among the leaders of the navy.
During the second attack on Daming Mansion, Li Jun and Zhang Shun went out to lure the enemy and lured Suo Chao into a trap, causing Suo Chao to be captured by Liangshan.
When Liangshan ranked the seats, Li Jun ranked 26th, with the star number Tianshouxing. He was the first leader of the navy, and guarded the southeast water village together with Ruan Xiaoer.
When Gao Qiu was defeated three times, Liang Shanshui's army showed great power. Li Jun captured and killed Liu Menglong, the commander of the Jinling navy, and together with Zhang Heng captured Wang Wende, the military governor of Hongnong in the north of Beijing. After Liangshan was recruited, Li Jun followed Song Jiang in the south and north, and made many military exploits.
During the expedition against the Liao Kingdom, Li Jun led the navy to seize the water gate of Tanzhou and assisted the Song army in capturing Tanzhou. Later, he assisted Privy Zhao and stayed in Tanzhou.
During the campaign against Tian Hu, Li Jun followed Guan Sheng to defeat Yushe, Dagu and other counties. Hearing that Lu Junyi was unable to attack Taiyuan, he bid farewell to Guan Sheng and rushed to Lu Junyi's army in the rain to propose a water attack strategy, dig Zhibo Canal and flood Taiyuan. After Taiyuan City was flooded, Li Jun led his navy to fly across the river and float in the sky to seize the four city gates, only to kill "the chickens and dogs could not hear them, and there were piles of corpses" in the city.
During the expedition against Wang Qing, Li Jun led the navy to fight in the Qutang Gorge, killing the navy commander Wen Renshi Chong, and released the deputy general Hu Jun. He captured Yun'an Prefecture and killed Shi Jun who stayed behind. Later, he and the Tong family The brothers disguised themselves as fishermen, ambush the Qingjiang River, and captured the bandit leader Wang Qing alive. With the help of Hu Jun, he recruited Dongchuan and Ande to surrender, so that "peasants never leave their fields and merchants never leave their houses", and he took the first place in the battle to pacify Huaixi.
After pacifying Huaixi, the Liangshan Army returned to the court and stationed outside Tokyo. However, the imperial court issued an edict prohibiting generals from entering the city without permission, and all the generals in Liangshan complained. Li Jun, San Ruan, Er Zhang and other naval leaders went to ask military advisor Wu Yong to make the decision, expressing their intention to plunder Tokyo and return to Liangshan to park Luocao. But Wu Yong did not dare to advocate, so Li Jun and others had to give up.
During the expedition against Fangla, Li Jun led the navy to regain Jiangyin and Taicang, and went to Taihu Lake with Tong Wei and Tong Meng to conduct reconnaissance. At Yuliuzhuang, he met Fei Bao, Ni Yun, Bu Qing, and Di Cheng. They became sworn brothers and later assisted Song Jiang in capturing Suzhou and killing General Feishui Changsheng. When Song Jiang took Hangzhou, Li Jun led his army to attack Humen. He and Shi Xiu took the lead in ascending the city and captured the defender Wu Zhi together. Later, Li Jun led the navy leader to pretend to surrender in Qingxi City, and was named the general manager of the navy capital by Fang La. He then set fire to the city, assisted the army in breaking the city, and finally put down the Fang La rebellion. In "The Legacy of Xuanhe of the Song Dynasty" from the Song and Yuan Dynasties, among the thirty-six subordinates of Song Jiang was "Li Hai, the Hunjiang Dragon", who was the prototype of Li Jun. At the same time, Gong Kai's "Thirty-six People in Song Jiang" included Li Jun, who praised "The good dragon is in the river, and it will save you if you shoot it. The Emperor Wu is so majestic, but he cherishes his divine arms." These two literary works are considered to be the prototype or blueprint of "Water Margin", and they should also be the earliest sources of the character Li Jun.
Some researchers believe that the ending of Li Jun going to sea and becoming king was based on the legend of the Tang Dynasty legend "The Legend of the Qiu Bearded Guest". In addition, the plot in Chapter 120 of "Mixing rivers and dragon water flooding Taiyuan City" may be based on the historical facts of Song Taizu Zhao Kuangyin flooding Taiyuan in "History of the Song Dynasty".
In addition, the famous pirate Zheng Guang in the early Southern Song Dynasty was nicknamed "Gunhai Jiao", and some people believe that he may be one of Li Jun's prototypes. "Hunjianglong" is a tool used to control rivers and sweep away river sand. In the Song Dynasty, in order to clean up the sediment in the Yellow River, a huge iron rake was invented to stir up the sediment at the bottom of the water and make the sand flow away with the water. This iron rake is called "Roller River Dragon", also known as "Hunjiang Dragon". When Jin Fu was regulating the river in the Qing Dynasty, he also used the Hunjiang Dragon to climb the river, but it was later abandoned because the river governor Gao Jin thought it was useless. Li Jun was nicknamed "Hunjianglong", which means turning the rivers upside down. However, it cannot be confirmed whether it is related to the river control tool.
Some people also believe that Li Jun was just a hero in the world at first, but in the end he became a king in the world, and was nicknamed "Long in the River", implying that he was a "real dragon" who had "blended" into the world.