Zheng Chongjian was a scholar in the forty-four years of Wanli (16 16). He first served as an official in Henan and then as an assistant minister in Jinan. In the early years of Chongzhen, he was promoted to participate in Shaanxi's right-wing political participation, and later he was promoted to the right-wing imperial history and the governor of Ningxia. During this period, he defeated the Mongolian tribes in Hetao area many times and got the silver coins of the court. Yin Feng's descendants are thousands of hereditary Royal Guards.
In the 12th year of Chongzhen (1639), in the first month, Zheng Chongjian was promoted to the position of right assistant minister of the Ministry of War, succeeding the Governor of Hong Chengchou and the Trilateral Military Affairs of Shaanxi. In May, Zhang rebelled in Gucheng, Luo Rucai and other nine rebelled, and Xing 'an (now Ankang, Shaanxi) was in a hurry. Xiong Wencan, the prime minister, asked the emperor to order Wang Aoyong, the governor of Yunyang, to guard Jiangling and Yuan 'an, Ding, the governor of Shaanxi, and Shao Jiechun, the governor of Sichuan, to guard their respective jurisdictions, and Zheng Chongjian presided over the joint attack. At this time, the three company commanders of Guyuan, Lintao and Ningxia, Zuo Guangxian, Cao Bianjiao and Kyle, had followed Hong Chengchou into Weidu, and only Chai Shihua returned to Gansu halfway. Zheng Chongjian called him, but he did not respond. Zheng Chongjian asked his lieutenant, He, to send troops from Ann. Unexpectedly, when Li Guoqi's team arrived in Lueyang, the soldiers booed and took away the rent of King Rui. At that time, Li Guoqi had been promoted to Shaanxi company commander, but he was removed from his new post and Zheng Chongjian was demoted to an official.