It is not known when Zhu Mei was born. Both his biography in the Old Book of Tang and the New Book of Tang indicated that he was from Bin Prefecture, the capital of Binning Circuit. The Old Book of Tang further indicated that when he was young, he served in the Tang Dynasty border army and eventually became a prefectural prefect, while the New Book of Tang indicated that he served as an army officer at a prefecture. There were records of an officer named Zhu Mei who served at Hedong Circuit, who, as of 879, was serving under the military governor Li Kan, who was ordered by Li Kan to arrest and kill soldiers who had previously been under the executed officer He Gongya who, after He Gongya's death, were creating disturbances in the Hedong capital Taiyuan Municipality, claiming to be trying to allege He Gongya. That Zhu Mei was later, in late 880, under the command of the military governorZheng Congdang, given the command of Hedong soldiers and ordered to aid the imperial capitalChang'an, then under the impending attacks by the major agrarian rebel Huang Chao. It is not completely clear that this referred to the same Zhu Mei here. In any case, as of summer 881, Zhu Mei was serving as the defender of Tongsai, when Huang, who had by that point captured Chang'an and declared himself emperor of a new state of Qi, sent his general Wang Mei to Binning to serve as its military governor. Zhu attacked and killed Wang, and then, yielding the military governor position to another officer, Li Chonggu, took his forces toward Chang'an, ready to attack Huang in coordination with other Tang generals Tang Hongfu, Wang Chongrong, Wang Chucun, Tuoba Sigong, and Zheng Tian. After joint Tang forces briefly recaptured Chang'an but then were forced to abandon it again in light of a major defeat at the hands of Qi forces, Zhu, who by that point carried the title of deputy military governor of Binning, stationed his own troops at Xingping. The Qi general Wang Bo put Xingping under siege, and Zhu retreated to Fengtian and Longwei Slope.
As military governor of Binning/Jingnan
In fall 881, Zhu Mei was made Binning's military governor, and, yet later in the year, was made the commander of the Tang forces south of the Wei River. After joint Tang forces recaptured Chang'an in spring 883, Emperor Xizong bestowed on him the honorary chancellor title of Tong Zhongshu Menxia Pingzhangshi. In 884, Emperor Xizong, apparently to commemorate the contributions of the Binning soldiers, renamed the circuit Jingnan. In 885, by which time Emperor Xizong had returned to Chang'an, the powerful eunuch Tian Lingzi became embroiled in a dispute with Wang Chongrong, then the military governor of Hezhong Circuit over Tian's attempt to seize control of salt ponds at Hezhong from Wang. Tian tried to neutralize Wang by transferring him to Taining Circuit, but Wang refused, and Wang and his allyLi Keyong the military governor of Hedong prepared to resist. Tian, in turn, allied himself with Zhu and Li Changfu the military governor of Fengxiang Circuit. Zhu, in order to further instigate Emperor Xizong into ordering a campaign against Li Keyong, several times sent covert operatives into Chang'an to set fire to imperial storages or to assassinate Emperor Xizong's attendants, to blame this on Li Keyong. Tian thereafter gathered his own forces and rendezvoused with Zhu and Li Changfu. They engaged those of Li Keyong and Wang, but around the new year 886 were crushed by Li Keyong and Wang. Li Keyong then approached Chang'an, causing Tian to take Emperor Xizong to first flee to Fengxiang, and then to Xingyuan.
Support of Li Yun as emperor
Most imperial officials accompanied Emperor Xizong to Fengxiang, but did not follow him to Xingyuan when Tian Lingzi took him there. While Emperor Xizong was still at Fengxiang, apparently to try to pry him from Tian's influence, the chancellor Xiao Gou summoned Zhu Mei and his troops to Fengxiang, but when Zhu arrived at Fengxiang with 5,000 soldiers, Emperor Xizong had already fled. Zhu and Li Changfu, turning against Tian, launched troops to try to chase down Emperor Xizong and Tian, but even though they initially had successes against Tian's troops, they were unable to catch up with Emperor Xizong and Tian. Zhu, however, captured Emperor Xizong's distant relative Li Yun the Prince of Xiang; he took Li Yun and returned to Fengxiang. Zhu, concluding that Emperor Xizong could never be pried away from Tian's influence, resolved to support a new emperor, with Li Changfu's concurrence. He tried to get Xiao to cooperate with him. However, he was able to force the other imperial officials into supporting Li Yun as regent. Zhu had himself named the commander of the imperial guards, and subsequently accompanied Li Yun back to Chang'an. The chancellor Pei Che remained chancellor, while Zheng Changtu was also made chancellor to replace Xiao. Once Zhu and Li Yun arrived at Chang'an, Zhu had Li Yun bestow him the chancellor title of Shizhong, as well as making him the director of the salt and iron monopolies. It was said that some 60-70% of the regional governors agreed to support Li Yun as emperor. Li Changfu, however, angry that Zhu made himself chancellor and did not grant Li Changfu the same honors, refused to support Li Yun and instead resubmitted to Emperor Xizong. Wang Chongrong and Li Keyong also submitted petitions pledging allegiance to Emperor Xizong, despite Zhu's attempts to win them over. Li Yun nevertheless claimed the imperial title in winter 886, and honored Emperor Xizong as Taishang Huang.
Death
Zhu Mei subsequently sent his officer Wang Xingyu, with 50,000 soldiers, to try to attack Xingyuan to capture Emperor Xizong. However, although Wang was initially able to defeat Tian's subordinate Yang Sheng, he was subsequently repelled by Man Cun, and was unable to advance. He thus became fearful that Zhu would punish him for his failures. Further, the eunuch Yang Fugong, who had succeeded Tian by this point, issued a declaration that anyone who killed Zhu would be given Jingnan Circuit. Wang therefore decided to turn against Zhu. Around the new year 887, he returned to Chang'an without first receiving permission from Zhu. Zhu, in anger, summoned him, stating, "You returned without permission. Are you planning to commit treason?" Wang responded, "I am not committing treason. I am trying to capture the treasonous Zhu Mei!" He seized Zhu and executed him. Pei Che and Zheng Changtu escorted Li Yun and fled to Hezhong, hoping that Wang Chongrong would protect them, but Wang Chongrong instead executed Li Yun and arrested Pei and Zheng. Both Zhu's and Li Yun's heads were delivered to Xingyuan and presented to Emperor Xizong.
